1 | /*- |
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2 | * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org> |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | /* |
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28 | FUNCTION |
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29 | <<posix_spawn>>, <<posix_spawnp>>---spawn a process |
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30 | |
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31 | INDEX |
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32 | posix_spawn |
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33 | INDEX |
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34 | posix_spawnp |
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35 | |
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36 | SYNOPSIS |
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37 | #include <spawn.h> |
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38 | |
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39 | int posix_spawn(pid_t *<[pid]>, const char *<[path]>, |
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40 | const posix_spawn_file_actions_t *<[file_actions]>, |
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41 | const posix_spawnattr_t *<[attrp]>, |
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42 | char *const <[argv]>, char *const <[envp]>); |
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43 | int posix_spawnp(pid_t *<[pid]>, const char *<[file]>, |
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44 | const posix_spawn_file_actions_t *<[file_actions]>, |
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45 | const posix_spawnattr_t *<[attrp]>, |
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46 | char *const <[argv]>, char *const <[envp]>); |
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47 | |
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48 | DESCRIPTION |
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49 | Use <<posix_spawn>> and <<posix_spawnp>> to create a new child process |
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50 | from the specified process image file. <<argc>> is the argument count |
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51 | and <<argv>> is an array of argument strings passed to the new program. |
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52 | <<envp>> is an array of stings, which are passed as environment to the |
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53 | new program. |
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54 | |
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55 | The <<path>> argument to <<posix_spawn>> identifies the new process |
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56 | image file to execute. The <<file>> argument to <<posix_spawnp>> is |
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57 | used to construct a pathname that identifies the new process image |
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58 | file by duplicating the actions of the shell in searching for an |
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59 | executable file if the specified filename does not contain a `<</>>' |
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60 | character. The <<file>> is sought in the colon-separated list of |
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61 | directory pathnames specified in the <<PATH>> environment variable. |
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62 | |
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63 | The file descriptors remain open across <<posix_spawn>> and |
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64 | <<posix_spawnp>> except for those marked as close-on-exec. The open |
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65 | file descriptors in the child process can be modified by the spawn file |
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66 | actions object pointed to by <<file_actions>>. |
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67 | |
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68 | The spawn attributes object type pointed to by <<attrp>> argument |
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69 | may contain any of the attributes defined in <<spawn.h>>. |
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70 | |
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71 | RETURNS |
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72 | <<posix_spawn>> and <<posix_spawnp>> return the process ID of the newly |
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73 | spawned child process in the variable pointed by a non-NULL <<*<[pid]>>> |
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74 | argument and zero as the function return value upon successful |
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75 | completion. Otherwise, <<posix_spawn>> and <<posix_spawnp>> return an |
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76 | error number as the function return value to indicate the error; the |
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77 | value stored into the variable pointed to by a non-NULL <<*<[pid]>>> |
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78 | argument is unspecified. |
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79 | |
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80 | PORTABILITY |
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81 | POSIX.1-2008 requires <<posix_spawn>> and <<posix_spawnp>>. |
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82 | |
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83 | Supporting OS subroutines required: <<_close>>, <<dup2>>, <<_fcntl>>, |
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84 | <<_execve>>, <<execvpe>>, <<_exit>>, <<_open>>, <<sigaction>>, |
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85 | <<sigprocmask>>, <<waitpid>>, <<sched_setscheduler>>, |
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86 | <<sched_setparam>>, <<setegid>>, <<seteuid>>, <<setpgid>>, <<vfork>>. |
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87 | */ |
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88 | |
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89 | #ifndef _NO_POSIX_SPAWN |
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90 | |
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91 | #include <sys/cdefs.h> |
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92 | |
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93 | #include <sys/signal.h> |
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94 | #include <sys/queue.h> |
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95 | #include <sys/wait.h> |
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96 | |
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97 | #include <errno.h> |
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98 | #include <fcntl.h> |
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99 | #include <sched.h> |
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100 | #include <spawn.h> |
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101 | #include <signal.h> |
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102 | #include <stdlib.h> |
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103 | #include <string.h> |
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104 | #include <unistd.h> |
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105 | |
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106 | /* Only deal with a pointer to environ, to work around subtle bugs with shared |
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107 | libraries and/or small data systems where the user declares his own |
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108 | 'environ'. */ |
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109 | static char ***p_environ = &environ; |
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110 | |
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111 | struct __posix_spawnattr { |
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112 | short sa_flags; |
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113 | pid_t sa_pgroup; |
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114 | struct sched_param sa_schedparam; |
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115 | int sa_schedpolicy; |
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116 | sigset_t sa_sigdefault; |
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117 | sigset_t sa_sigmask; |
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118 | }; |
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119 | |
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120 | struct __posix_spawn_file_actions { |
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121 | STAILQ_HEAD(, __posix_spawn_file_actions_entry) fa_list; |
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122 | }; |
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123 | |
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124 | typedef struct __posix_spawn_file_actions_entry { |
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125 | STAILQ_ENTRY(__posix_spawn_file_actions_entry) fae_list; |
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126 | enum { FAE_OPEN, FAE_DUP2, FAE_CLOSE } fae_action; |
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127 | |
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128 | int fae_fildes; |
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129 | union { |
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130 | struct { |
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131 | char *path; |
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132 | #define fae_path fae_data.open.path |
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133 | int oflag; |
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134 | #define fae_oflag fae_data.open.oflag |
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135 | mode_t mode; |
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136 | #define fae_mode fae_data.open.mode |
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137 | } open; |
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138 | struct { |
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139 | int newfildes; |
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140 | #define fae_newfildes fae_data.dup2.newfildes |
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141 | } dup2; |
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142 | } fae_data; |
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143 | } posix_spawn_file_actions_entry_t; |
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144 | |
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145 | /* |
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146 | * Spawn routines |
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147 | */ |
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148 | |
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149 | static int |
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150 | process_spawnattr(const posix_spawnattr_t sa) |
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151 | { |
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152 | struct sigaction sigact = { .sa_flags = 0, .sa_handler = SIG_DFL }; |
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153 | int i; |
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154 | |
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155 | /* |
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156 | * POSIX doesn't really describe in which order everything |
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157 | * should be set. We'll just set them in the order in which they |
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158 | * are mentioned. |
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159 | */ |
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160 | |
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161 | /* Set process group */ |
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162 | if (sa->sa_flags & POSIX_SPAWN_SETPGROUP) { |
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163 | if (setpgid(0, sa->sa_pgroup) != 0) |
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164 | return (errno); |
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165 | } |
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166 | |
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167 | /* Set scheduler policy */ |
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168 | if (sa->sa_flags & POSIX_SPAWN_SETSCHEDULER) { |
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169 | if (sched_setscheduler(0, sa->sa_schedpolicy, |
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170 | &sa->sa_schedparam) != 0) |
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171 | return (errno); |
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172 | } else if (sa->sa_flags & POSIX_SPAWN_SETSCHEDPARAM) { |
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173 | if (sched_setparam(0, &sa->sa_schedparam) != 0) |
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174 | return (errno); |
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175 | } |
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176 | |
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177 | /* Reset user ID's */ |
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178 | if (sa->sa_flags & POSIX_SPAWN_RESETIDS) { |
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179 | if (setegid(getgid()) != 0) |
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180 | return (errno); |
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181 | if (seteuid(getuid()) != 0) |
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182 | return (errno); |
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183 | } |
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184 | |
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185 | /* Set signal masks/defaults */ |
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186 | if (sa->sa_flags & POSIX_SPAWN_SETSIGMASK) { |
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187 | sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL); |
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188 | } |
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189 | |
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190 | if (sa->sa_flags & POSIX_SPAWN_SETSIGDEF) { |
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191 | for (i = 1; i < NSIG; i++) { |
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192 | if (sigismember(&sa->sa_sigdefault, i)) |
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193 | if (sigaction(i, &sigact, NULL) != 0) |
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194 | return (errno); |
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195 | } |
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196 | } |
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197 | |
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198 | return (0); |
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199 | } |
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200 | |
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201 | static int |
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202 | process_file_actions_entry(posix_spawn_file_actions_entry_t *fae) |
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203 | { |
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204 | int fd; |
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205 | |
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206 | switch (fae->fae_action) { |
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207 | case FAE_OPEN: |
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208 | /* Perform an open(), make it use the right fd */ |
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209 | fd = _open(fae->fae_path, fae->fae_oflag, fae->fae_mode); |
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210 | if (fd < 0) |
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211 | return (errno); |
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212 | if (fd != fae->fae_fildes) { |
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213 | if (dup2(fd, fae->fae_fildes) == -1) |
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214 | return (errno); |
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215 | if (_close(fd) != 0) { |
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216 | if (errno == EBADF) |
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217 | return (EBADF); |
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218 | } |
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219 | } |
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220 | #ifdef HAVE_FCNTL |
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221 | if (_fcntl(fae->fae_fildes, F_SETFD, 0) == -1) |
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222 | return (errno); |
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223 | #endif /* HAVE_FCNTL */ |
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224 | break; |
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225 | case FAE_DUP2: |
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226 | /* Perform a dup2() */ |
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227 | if (dup2(fae->fae_fildes, fae->fae_newfildes) == -1) |
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228 | return (errno); |
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229 | #ifdef HAVE_FCNTL |
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230 | if (_fcntl(fae->fae_newfildes, F_SETFD, 0) == -1) |
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231 | return (errno); |
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232 | #endif /* HAVE_FCNTL */ |
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233 | break; |
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234 | case FAE_CLOSE: |
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235 | /* Perform a close(), do not fail if already closed */ |
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236 | (void)_close(fae->fae_fildes); |
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237 | break; |
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238 | } |
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239 | return (0); |
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240 | } |
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241 | |
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242 | static int |
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243 | process_file_actions(const posix_spawn_file_actions_t fa) |
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244 | { |
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245 | posix_spawn_file_actions_entry_t *fae; |
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246 | int error; |
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247 | |
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248 | /* Replay all file descriptor modifications */ |
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249 | STAILQ_FOREACH(fae, &fa->fa_list, fae_list) { |
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250 | error = process_file_actions_entry(fae); |
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251 | if (error) |
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252 | return (error); |
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253 | } |
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254 | return (0); |
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255 | } |
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256 | |
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257 | static int |
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258 | do_posix_spawn(pid_t *pid, const char *path, |
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259 | const posix_spawn_file_actions_t *fa, |
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260 | const posix_spawnattr_t *sa, |
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261 | char * const argv[], char * const envp[], int use_env_path) |
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262 | { |
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263 | pid_t p; |
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264 | volatile int error = 0; |
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265 | |
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266 | p = vfork(); |
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267 | switch (p) { |
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268 | case -1: |
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269 | return (errno); |
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270 | case 0: |
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271 | if (sa != NULL) { |
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272 | error = process_spawnattr(*sa); |
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273 | if (error) |
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274 | _exit(127); |
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275 | } |
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276 | if (fa != NULL) { |
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277 | error = process_file_actions(*fa); |
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278 | if (error) |
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279 | _exit(127); |
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280 | } |
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281 | if (use_env_path) |
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282 | execvpe(path, argv, envp != NULL ? envp : *p_environ); |
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283 | else |
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284 | _execve(path, argv, envp != NULL ? envp : *p_environ); |
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285 | error = errno; |
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286 | _exit(127); |
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287 | default: |
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288 | if (error != 0) |
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289 | waitpid(p, NULL, WNOHANG); |
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290 | else if (pid != NULL) |
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291 | *pid = p; |
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292 | return (error); |
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293 | } |
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294 | } |
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295 | |
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296 | int |
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297 | posix_spawn (pid_t *pid, |
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298 | const char *path, |
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299 | const posix_spawn_file_actions_t *fa, |
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300 | const posix_spawnattr_t *sa, |
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301 | char * const argv[], |
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302 | char * const envp[]) |
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303 | { |
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304 | return do_posix_spawn(pid, path, fa, sa, argv, envp, 0); |
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305 | } |
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306 | |
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307 | int |
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308 | posix_spawnp (pid_t *pid, |
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309 | const char *path, |
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310 | const posix_spawn_file_actions_t *fa, |
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311 | const posix_spawnattr_t *sa, |
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312 | char * const argv[], |
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313 | char * const envp[]) |
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314 | { |
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315 | return do_posix_spawn(pid, path, fa, sa, argv, envp, 1); |
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316 | } |
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317 | |
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318 | /* |
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319 | * File descriptor actions |
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320 | */ |
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321 | |
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322 | int |
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323 | posix_spawn_file_actions_init (posix_spawn_file_actions_t *ret) |
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324 | { |
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325 | posix_spawn_file_actions_t fa; |
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326 | |
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327 | fa = malloc(sizeof(struct __posix_spawn_file_actions)); |
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328 | if (fa == NULL) |
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329 | return (-1); |
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330 | |
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331 | STAILQ_INIT(&fa->fa_list); |
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332 | *ret = fa; |
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333 | return (0); |
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334 | } |
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335 | |
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336 | int |
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337 | posix_spawn_file_actions_destroy (posix_spawn_file_actions_t *fa) |
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338 | { |
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339 | posix_spawn_file_actions_entry_t *fae; |
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340 | |
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341 | while ((fae = STAILQ_FIRST(&(*fa)->fa_list)) != NULL) { |
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342 | /* Remove file action entry from the queue */ |
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343 | STAILQ_REMOVE_HEAD(&(*fa)->fa_list, fae_list); |
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344 | |
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345 | /* Deallocate file action entry */ |
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346 | if (fae->fae_action == FAE_OPEN) |
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347 | free(fae->fae_path); |
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348 | free(fae); |
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349 | } |
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350 | |
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351 | free(*fa); |
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352 | return (0); |
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353 | } |
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354 | |
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355 | int |
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356 | posix_spawn_file_actions_addopen (posix_spawn_file_actions_t * __restrict fa, |
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357 | int fildes, |
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358 | const char * __restrict path, |
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359 | int oflag, |
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360 | mode_t mode) |
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361 | { |
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362 | posix_spawn_file_actions_entry_t *fae; |
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363 | int error; |
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364 | |
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365 | if (fildes < 0) |
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366 | return (EBADF); |
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367 | |
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368 | /* Allocate object */ |
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369 | fae = malloc(sizeof(posix_spawn_file_actions_entry_t)); |
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370 | if (fae == NULL) |
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371 | return (errno); |
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372 | |
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373 | /* Set values and store in queue */ |
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374 | fae->fae_action = FAE_OPEN; |
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375 | fae->fae_path = strdup(path); |
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376 | if (fae->fae_path == NULL) { |
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377 | error = errno; |
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378 | free(fae); |
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379 | return (error); |
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380 | } |
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381 | fae->fae_fildes = fildes; |
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382 | fae->fae_oflag = oflag; |
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383 | fae->fae_mode = mode; |
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384 | |
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385 | STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list); |
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386 | return (0); |
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387 | } |
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388 | |
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389 | int |
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390 | posix_spawn_file_actions_adddup2 (posix_spawn_file_actions_t *fa, |
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391 | int fildes, |
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392 | int newfildes) |
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393 | { |
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394 | posix_spawn_file_actions_entry_t *fae; |
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395 | |
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396 | if (fildes < 0 || newfildes < 0) |
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397 | return (EBADF); |
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398 | |
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399 | /* Allocate object */ |
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400 | fae = malloc(sizeof(posix_spawn_file_actions_entry_t)); |
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401 | if (fae == NULL) |
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402 | return (errno); |
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403 | |
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404 | /* Set values and store in queue */ |
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405 | fae->fae_action = FAE_DUP2; |
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406 | fae->fae_fildes = fildes; |
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407 | fae->fae_newfildes = newfildes; |
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408 | |
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409 | STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list); |
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410 | return (0); |
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411 | } |
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412 | |
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413 | int |
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414 | posix_spawn_file_actions_addclose (posix_spawn_file_actions_t *fa, |
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415 | int fildes) |
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416 | { |
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417 | posix_spawn_file_actions_entry_t *fae; |
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418 | |
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419 | if (fildes < 0) |
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420 | return (EBADF); |
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421 | |
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422 | /* Allocate object */ |
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423 | fae = malloc(sizeof(posix_spawn_file_actions_entry_t)); |
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424 | if (fae == NULL) |
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425 | return (errno); |
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426 | |
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427 | /* Set values and store in queue */ |
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428 | fae->fae_action = FAE_CLOSE; |
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429 | fae->fae_fildes = fildes; |
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430 | |
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431 | STAILQ_INSERT_TAIL(&(*fa)->fa_list, fae, fae_list); |
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432 | return (0); |
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433 | } |
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434 | |
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435 | /* |
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436 | * Spawn attributes |
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437 | */ |
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438 | |
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439 | int |
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440 | posix_spawnattr_init (posix_spawnattr_t *ret) |
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441 | { |
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442 | posix_spawnattr_t sa; |
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443 | |
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444 | sa = calloc(1, sizeof(struct __posix_spawnattr)); |
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445 | if (sa == NULL) |
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446 | return (errno); |
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447 | |
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448 | /* Set defaults as specified by POSIX, cleared above */ |
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449 | *ret = sa; |
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450 | return (0); |
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451 | } |
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452 | |
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453 | int |
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454 | posix_spawnattr_destroy (posix_spawnattr_t *sa) |
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455 | { |
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456 | free(*sa); |
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457 | return (0); |
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458 | } |
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459 | |
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460 | int |
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461 | posix_spawnattr_getflags (const posix_spawnattr_t * __restrict sa, |
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462 | short * __restrict flags) |
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463 | { |
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464 | *flags = (*sa)->sa_flags; |
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465 | return (0); |
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466 | } |
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467 | |
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468 | int |
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469 | posix_spawnattr_getpgroup (const posix_spawnattr_t * __restrict sa, |
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470 | pid_t * __restrict pgroup) |
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471 | { |
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472 | *pgroup = (*sa)->sa_pgroup; |
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473 | return (0); |
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474 | } |
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475 | |
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476 | int |
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477 | posix_spawnattr_getschedparam (const posix_spawnattr_t * __restrict sa, |
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478 | struct sched_param * __restrict schedparam) |
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479 | { |
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480 | *schedparam = (*sa)->sa_schedparam; |
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481 | return (0); |
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482 | } |
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483 | |
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484 | int |
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485 | posix_spawnattr_getschedpolicy (const posix_spawnattr_t * __restrict sa, |
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486 | int * __restrict schedpolicy) |
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487 | { |
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488 | *schedpolicy = (*sa)->sa_schedpolicy; |
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489 | return (0); |
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490 | } |
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491 | |
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492 | int |
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493 | posix_spawnattr_getsigdefault (const posix_spawnattr_t * __restrict sa, |
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494 | sigset_t * __restrict sigdefault) |
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495 | { |
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496 | *sigdefault = (*sa)->sa_sigdefault; |
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497 | return (0); |
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498 | } |
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499 | |
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500 | int |
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501 | posix_spawnattr_getsigmask (const posix_spawnattr_t * __restrict sa, |
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502 | sigset_t * __restrict sigmask) |
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503 | { |
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504 | *sigmask = (*sa)->sa_sigmask; |
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505 | return (0); |
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506 | } |
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507 | |
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508 | int |
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509 | posix_spawnattr_setflags (posix_spawnattr_t *sa, |
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510 | short flags) |
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511 | { |
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512 | (*sa)->sa_flags = flags; |
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513 | return (0); |
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514 | } |
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515 | |
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516 | int |
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517 | posix_spawnattr_setpgroup (posix_spawnattr_t *sa, |
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518 | pid_t pgroup) |
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519 | { |
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520 | (*sa)->sa_pgroup = pgroup; |
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521 | return (0); |
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522 | } |
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523 | |
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524 | int |
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525 | posix_spawnattr_setschedparam (posix_spawnattr_t * __restrict sa, |
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526 | const struct sched_param * __restrict schedparam) |
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527 | { |
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528 | (*sa)->sa_schedparam = *schedparam; |
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529 | return (0); |
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530 | } |
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531 | |
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532 | int |
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533 | posix_spawnattr_setschedpolicy (posix_spawnattr_t *sa, |
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534 | int schedpolicy) |
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535 | { |
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536 | (*sa)->sa_schedpolicy = schedpolicy; |
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537 | return (0); |
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538 | } |
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539 | |
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540 | int |
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541 | posix_spawnattr_setsigdefault (posix_spawnattr_t * __restrict sa, |
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542 | const sigset_t * __restrict sigdefault) |
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543 | { |
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544 | (*sa)->sa_sigdefault = *sigdefault; |
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545 | return (0); |
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546 | } |
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547 | |
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548 | int |
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549 | posix_spawnattr_setsigmask (posix_spawnattr_t * __restrict sa, |
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550 | const sigset_t * __restrict sigmask) |
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551 | { |
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552 | (*sa)->sa_sigmask = *sigmask; |
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553 | return (0); |
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554 | } |
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555 | |
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556 | #endif /* !_NO_POSIX_SPAWN */ |
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