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glibc/stdio-common/perror.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <stdio.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <wchar.h> | |
#include "libioP.h" | |
static void | |
perror_internal (FILE *fp, const char *s, int errnum) | |
{ | |
char buf[1024]; | |
const char *colon; | |
const char *errstring; | |
if (s == NULL || *s == '\0') | |
s = colon = ""; | |
else | |
colon = ": "; | |
errstring = __strerror_r (errnum, buf, sizeof buf); | |
(void) __fxprintf (fp, "%s%s%s\n", s, colon, errstring); | |
} | |
/* Print a line on stderr consisting of the text in S, a colon, a space, | |
a message describing the meaning of the contents of `errno' and a newline. | |
If S is NULL or "", the colon and space are omitted. */ | |
void | |
perror (const char *s) | |
{ | |
int errnum = errno; | |
FILE *fp; | |
int fd = -1; | |
/* The standard says that 'perror' must not change the orientation | |
of the stream. What is supposed to happen when the stream isn't | |
oriented yet? In this case we'll create a new stream which is | |
using the same underlying file descriptor. */ | |
if (__builtin_expect (_IO_fwide (stderr, 0) != 0, 1) | |
|| (fd = __fileno (stderr)) == -1 | |
|| (fd = __dup (fd)) == -1 | |
|| (fp = fdopen (fd, "w+")) == NULL) | |
{ | |
if (__glibc_unlikely (fd != -1)) | |
__close (fd); | |
/* Use standard error as is. */ | |
perror_internal (stderr, s, errnum); | |
} | |
else | |
{ | |
/* We don't have to do any special hacks regarding the file | |
position. Since the stderr stream wasn't used so far we just | |
write to the descriptor. */ | |
perror_internal (fp, s, errnum); | |
if (_IO_ferror_unlocked (fp)) | |
stderr->_flags |= _IO_ERR_SEEN; | |
/* Close the stream. */ | |
fclose (fp); | |
} | |
} | |
libc_hidden_def (perror) |