-/* Copyright (C) 1991, 1992, 1993, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 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 Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
-#include <stdio.h>
#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);
+}
-extern char *_strerror_internal __P ((int, char *buf, size_t));
/* 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.
void
perror (const char *s)
{
- char buf[1024];
int errnum = errno;
- const char *colon;
+ FILE *fp;
+ int fd = -1;
- if (s == NULL || *s == '\0')
- s = colon = "";
+
+ /* 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
- colon = ": ";
+ {
+ /* 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;
- (void) fprintf (stderr, "%s%s%s\n",
- s, colon, _strerror_internal (errnum, buf, sizeof buf));
+ /* Close the stream. */
+ fclose (fp);
+ }
}
+libc_hidden_def (perror)