1 | /* |
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2 | FUNCTION |
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3 | <<tmpfile>>---create a temporary file |
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4 | |
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5 | INDEX |
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6 | tmpfile |
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7 | INDEX |
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8 | _tmpfile_r |
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9 | |
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10 | SYNOPSIS |
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11 | #include <stdio.h> |
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12 | FILE *tmpfile(void); |
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13 | |
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14 | FILE *_tmpfile_r(struct _reent *<[reent]>); |
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15 | |
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16 | DESCRIPTION |
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17 | Create a temporary file (a file which will be deleted automatically), |
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18 | using a name generated by <<tmpnam>>. The temporary file is opened with |
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19 | the mode <<"wb+">>, permitting you to read and write anywhere in it |
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20 | as a binary file (without any data transformations the host system may |
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21 | perform for text files). |
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22 | |
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23 | The alternate function <<_tmpfile_r>> is a reentrant version. The |
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24 | argument <[reent]> is a pointer to a reentrancy structure. |
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25 | |
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26 | RETURNS |
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27 | <<tmpfile>> normally returns a pointer to the temporary file. If no |
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28 | temporary file could be created, the result is NULL, and <<errno>> |
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29 | records the reason for failure. |
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30 | |
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31 | PORTABILITY |
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32 | Both ANSI C and the System V Interface Definition (Issue 2) require |
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33 | <<tmpfile>>. |
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34 | |
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35 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<getpid>>, |
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36 | <<isatty>>, <<lseek>>, <<open>>, <<read>>, <<sbrk>>, <<write>>. |
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37 | |
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38 | <<tmpfile>> also requires the global pointer <<environ>>. |
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39 | */ |
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40 | |
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41 | #include <_ansi.h> |
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42 | #include <reent.h> |
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43 | #include <stdio.h> |
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44 | #include <errno.h> |
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45 | #include <fcntl.h> |
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46 | #include <sys/stat.h> |
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47 | |
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48 | #ifndef O_BINARY |
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49 | # define O_BINARY 0 |
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50 | #endif |
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51 | |
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52 | FILE * |
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53 | _tmpfile_r (struct _reent *ptr) |
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54 | { |
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55 | FILE *fp; |
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56 | int e; |
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57 | char *f; |
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58 | char buf[L_tmpnam]; |
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59 | int fd; |
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60 | |
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61 | do |
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62 | { |
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63 | if ((f = _tmpnam_r (ptr, buf)) == NULL) |
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64 | return NULL; |
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65 | fd = _open_r (ptr, f, O_RDWR | O_CREAT | O_EXCL | O_BINARY, |
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66 | S_IRUSR | S_IWUSR); |
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67 | } |
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68 | while (fd < 0 && ptr->_errno == EEXIST); |
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69 | if (fd < 0) |
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70 | return NULL; |
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71 | fp = _fdopen_r (ptr, fd, "wb+"); |
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72 | e = ptr->_errno; |
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73 | if (!fp) |
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74 | _close_r (ptr, fd); |
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75 | (void) _remove_r (ptr, f); |
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76 | ptr->_errno = e; |
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77 | return fp; |
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78 | } |
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79 | |
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80 | #ifndef _REENT_ONLY |
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81 | |
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82 | FILE * |
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83 | tmpfile (void) |
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84 | { |
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85 | return _tmpfile_r (_REENT); |
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86 | } |
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87 | |
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88 | #endif |
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