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84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <wchar.h>
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#include "libioP.h"
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static void
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perror_internal (FILE *fp, const char *s, int errnum)
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{
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char buf[1024];
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const char *colon;
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const char *errstring;
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if (s == NULL || *s == '\0')
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s = colon = "";
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else
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colon = ": ";
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errstring = __strerror_r (errnum, buf, sizeof buf);
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(void) __fxprintf (fp, "%s%s%s\n", s, colon, errstring);
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}
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/* Print a line on stderr consisting of the text in S, a colon, a space,
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a message describing the meaning of the contents of `errno' and a newline.
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If S is NULL or "", the colon and space are omitted. */
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void
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perror (const char *s)
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{
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int errnum = errno;
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FILE *fp;
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int fd = -1;
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/* The standard says that 'perror' must not change the orientation
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of the stream. What is supposed to happen when the stream isn't
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oriented yet? In this case we'll create a new stream which is
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using the same underlying file descriptor. */
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if (__builtin_expect (_IO_fwide (stderr, 0) != 0, 1)
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|| (fd = __fileno (stderr)) == -1
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|| (fd = __dup (fd)) == -1
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|| (fp = fdopen (fd, "w+")) == NULL)
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{
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if (__glibc_unlikely (fd != -1))
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__close (fd);
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/* Use standard error as is. */
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perror_internal (stderr, s, errnum);
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}
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else
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{
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/* We don't have to do any special hacks regarding the file
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position. Since the stderr stream wasn't used so far we just
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write to the descriptor. */
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perror_internal (fp, s, errnum);
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if (_IO_ferror_unlocked (fp))
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stderr->_flags |= _IO_ERR_SEEN;
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/* Close the stream. */
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fclose (fp);
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}
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}
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libc_hidden_def (perror)
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