[444] | 1 | /* |
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| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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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 are permitted |
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| 6 | * provided that the above copyright notice and this paragraph are |
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| 7 | * duplicated in all such forms and that any documentation, |
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| 8 | * advertising materials, and other materials related to such |
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| 9 | * distribution and use acknowledge that the software was developed |
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| 10 | * by the University of California, Berkeley. The name of the |
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| 11 | * University may not be used to endorse or promote products derived |
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| 12 | * from this software without specific prior written permission. |
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| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | */ |
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| 17 | |
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| 18 | /* |
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| 19 | FUNCTION |
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| 20 | <<perror>>---print an error message on standard error |
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| 21 | |
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| 22 | INDEX |
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| 23 | perror |
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| 24 | INDEX |
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| 25 | _perror_r |
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| 26 | |
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| 27 | SYNOPSIS |
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| 28 | #include <stdio.h> |
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| 29 | void perror(char *<[prefix]>); |
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| 30 | |
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| 31 | void _perror_r(struct _reent *<[reent]>, char *<[prefix]>); |
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| 32 | |
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| 33 | DESCRIPTION |
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| 34 | Use <<perror>> to print (on standard error) an error message |
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| 35 | corresponding to the current value of the global variable <<errno>>. |
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| 36 | Unless you use <<NULL>> as the value of the argument <[prefix]>, the |
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| 37 | error message will begin with the string at <[prefix]>, followed by a |
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| 38 | colon and a space (<<: >>). The remainder of the error message is one |
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| 39 | of the strings described for <<strerror>>. |
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| 40 | |
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| 41 | The alternate function <<_perror_r>> is a reentrant version. The |
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| 42 | extra argument <[reent]> is a pointer to a reentrancy structure. |
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| 43 | |
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| 44 | RETURNS |
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| 45 | <<perror>> returns no result. |
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| 46 | |
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| 47 | PORTABILITY |
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| 48 | ANSI C requires <<perror>>, but the strings issued vary from one |
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| 49 | implementation to another. |
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| 50 | |
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| 51 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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| 52 | <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
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| 53 | */ |
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| 54 | |
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| 55 | #include <_ansi.h> |
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| 56 | #include <reent.h> |
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| 57 | #include <stdio.h> |
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| 58 | #include <string.h> |
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| 59 | #include "local.h" |
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| 60 | |
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| 61 | void |
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| 62 | _perror_r (struct _reent *ptr, |
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| 63 | const char *s) |
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| 64 | { |
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| 65 | char *error; |
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| 66 | int dummy; |
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| 67 | |
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| 68 | _REENT_SMALL_CHECK_INIT (ptr); |
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| 69 | if (s != NULL && *s != '\0') |
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| 70 | { |
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| 71 | fputs (s, _stderr_r (ptr)); |
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| 72 | fputs (": ", _stderr_r (ptr)); |
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| 73 | } |
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| 74 | |
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| 75 | if ((error = _strerror_r (ptr, ptr->_errno, 1, &dummy)) != NULL) |
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| 76 | fputs (error, _stderr_r (ptr)); |
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| 77 | |
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| 78 | fputc ('\n', _stderr_r (ptr)); |
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| 79 | } |
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| 80 | |
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| 81 | #ifndef _REENT_ONLY |
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| 82 | |
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| 83 | void |
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| 84 | perror (const char *s) |
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| 85 | { |
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| 86 | _perror_r (_REENT, s); |
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| 87 | } |
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| 88 | |
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| 89 | #endif |
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