/* Copyright (C) 1991-1993,1997,1998,2000-2002 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <wchar.h> #ifdef USE_IN_LIBIO # include "libioP.h" #endif 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); #ifdef USE_IN_LIBIO if (_IO_fwide (fp, 0) > 0) (void) __fwprintf (fp, L"%s%s%s\n", s, colon, errstring); else #endif (void) fprintf (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; #ifdef USE_IN_LIBIO 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 (__builtin_expect (fd != -1, 0)) __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); /* Close the stream. */ fclose (fp); ((_IO_FILE *) stderr)->_offset = _IO_pos_BAD; } #else perror_internal (stderr, s, errnum); #endif } libc_hidden_def (perror)