mirror of
https://sourceware.org/git/glibc.git
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409 lines
9.8 KiB
C
409 lines
9.8 KiB
C
/* Error handler for noninteractive utilities
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Copyright (C) 1990-2017 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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<http://www.gnu.org/licenses/>. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#if !_LIBC
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# include <config.h>
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#endif
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#include "error.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !_LIBC && ENABLE_NLS
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# include "gettext.h"
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# define _(msgid) gettext (msgid)
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#endif
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#ifdef _LIBC
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# include <libintl.h>
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# include <stdbool.h>
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# include <stdint.h>
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# include <wchar.h>
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# define mbsrtowcs __mbsrtowcs
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# define USE_UNLOCKED_IO 0
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# define _GL_ATTRIBUTE_FORMAT_PRINTF(a, b)
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# define _GL_ARG_NONNULL(a)
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#endif
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#if USE_UNLOCKED_IO
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# include "unlocked-io.h"
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#endif
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#ifndef _
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# define _(String) String
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#endif
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/* If NULL, error will flush stdout, then print on stderr the program
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name, a colon and a space. Otherwise, error will call this
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function without parameters instead. */
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void (*error_print_progname) (void);
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/* This variable is incremented each time 'error' is called. */
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unsigned int error_message_count;
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#ifdef _LIBC
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/* In the GNU C library, there is a predefined variable for this. */
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# define program_name program_invocation_name
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# include <errno.h>
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# include <limits.h>
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# include <libio/libioP.h>
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/* In GNU libc we want do not want to use the common name 'error' directly.
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Instead make it a weak alias. */
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extern void __error (int status, int errnum, const char *message, ...)
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__attribute__ ((__format__ (__printf__, 3, 4)));
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extern void __error_at_line (int status, int errnum, const char *file_name,
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unsigned int line_number, const char *message,
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...)
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__attribute__ ((__format__ (__printf__, 5, 6)));;
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# define error __error
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# define error_at_line __error_at_line
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# include <libio/iolibio.h>
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# define fflush(s) _IO_fflush (s)
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# undef putc
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# define putc(c, fp) _IO_putc (c, fp)
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# include <libc-lock.h>
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#else /* not _LIBC */
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# include <fcntl.h>
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# include <unistd.h>
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# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* Get declarations of the native Windows API functions. */
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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/* Get _get_osfhandle. */
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# include "msvc-nothrow.h"
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# endif
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/* The gnulib override of fcntl is not needed in this file. */
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# undef fcntl
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# if !HAVE_DECL_STRERROR_R
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# ifndef HAVE_DECL_STRERROR_R
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"this configure-time declaration test was not run"
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# endif
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# if STRERROR_R_CHAR_P
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char *strerror_r ();
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# else
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int strerror_r ();
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# endif
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# endif
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/* The calling program should define program_name and set it to the
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name of the executing program. */
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extern char *program_name;
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# if HAVE_STRERROR_R || defined strerror_r
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# define __strerror_r strerror_r
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# endif /* HAVE_STRERROR_R || defined strerror_r */
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#endif /* not _LIBC */
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#if !_LIBC
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/* Return non-zero if FD is open. */
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static int
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is_open (int fd)
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{
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# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* On native Windows: The initial state of unassigned standard file
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descriptors is that they are open but point to an INVALID_HANDLE_VALUE.
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There is no fcntl, and the gnulib replacement fcntl does not support
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F_GETFL. */
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return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
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# else
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# ifndef F_GETFL
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# error Please port fcntl to your platform
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# endif
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return 0 <= fcntl (fd, F_GETFL);
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# endif
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}
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#endif
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static void
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flush_stdout (void)
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{
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#if !_LIBC
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int stdout_fd;
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# if GNULIB_FREOPEN_SAFER
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/* Use of gnulib's freopen-safer module normally ensures that
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fileno (stdout) == 1
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whenever stdout is open. */
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stdout_fd = STDOUT_FILENO;
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# else
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/* POSIX states that fileno (stdout) after fclose is unspecified. But in
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practice it is not a problem, because stdout is statically allocated and
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the fd of a FILE stream is stored as a field in its allocated memory. */
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stdout_fd = fileno (stdout);
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# endif
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/* POSIX states that fflush (stdout) after fclose is unspecified; it
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is safe in glibc, but not on all other platforms. fflush (NULL)
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is always defined, but too draconian. */
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if (0 <= stdout_fd && is_open (stdout_fd))
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#endif
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fflush (stdout);
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}
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static void
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print_errno_message (int errnum)
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{
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char const *s;
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#if defined HAVE_STRERROR_R || _LIBC
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char errbuf[1024];
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# if _LIBC || STRERROR_R_CHAR_P
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s = __strerror_r (errnum, errbuf, sizeof errbuf);
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# else
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if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)
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s = errbuf;
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else
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s = 0;
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# endif
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#else
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s = strerror (errnum);
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#endif
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#if !_LIBC
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if (! s)
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s = _("Unknown system error");
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#endif
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#if _LIBC
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__fxprintf (NULL, ": %s", s);
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#else
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fprintf (stderr, ": %s", s);
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#endif
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}
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static void _GL_ATTRIBUTE_FORMAT_PRINTF (3, 0) _GL_ARG_NONNULL ((3))
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error_tail (int status, int errnum, const char *message, va_list args)
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{
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#if _LIBC
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if (_IO_fwide (stderr, 0) > 0)
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{
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size_t len = strlen (message) + 1;
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wchar_t *wmessage = NULL;
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mbstate_t st;
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size_t res;
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const char *tmp;
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bool use_malloc = false;
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while (1)
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{
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if (__libc_use_alloca (len * sizeof (wchar_t)))
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wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
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else
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{
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if (!use_malloc)
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wmessage = NULL;
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wchar_t *p = (wchar_t *) realloc (wmessage,
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len * sizeof (wchar_t));
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if (p == NULL)
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{
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free (wmessage);
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fputws_unlocked (L"out of memory\n", stderr);
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return;
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}
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wmessage = p;
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use_malloc = true;
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}
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memset (&st, '\0', sizeof (st));
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tmp = message;
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res = mbsrtowcs (wmessage, &tmp, len, &st);
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if (res != len)
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break;
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if (__builtin_expect (len >= SIZE_MAX / sizeof (wchar_t) / 2, 0))
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{
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/* This really should not happen if everything is fine. */
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res = (size_t) -1;
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break;
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}
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len *= 2;
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}
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if (res == (size_t) -1)
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{
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/* The string cannot be converted. */
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if (use_malloc)
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{
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free (wmessage);
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use_malloc = false;
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}
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wmessage = (wchar_t *) L"???";
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}
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__vfwprintf (stderr, wmessage, args);
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if (use_malloc)
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free (wmessage);
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}
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else
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#endif
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vfprintf (stderr, message, args);
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va_end (args);
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++error_message_count;
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if (errnum)
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print_errno_message (errnum);
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#if _LIBC
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__fxprintf (NULL, "\n");
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#else
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putc ('\n', stderr);
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#endif
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fflush (stderr);
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if (status)
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exit (status);
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}
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/* Print the program name and error message MESSAGE, which is a printf-style
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format string with optional args.
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If ERRNUM is nonzero, print its corresponding system error message.
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Exit with status STATUS if it is nonzero. */
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void
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error (int status, int errnum, const char *message, ...)
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{
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va_list args;
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#if defined _LIBC && defined __libc_ptf_call
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/* We do not want this call to be cut short by a thread
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cancellation. Therefore disable cancellation for now. */
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int state = PTHREAD_CANCEL_ENABLE;
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__libc_ptf_call (__pthread_setcancelstate,
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(PTHREAD_CANCEL_DISABLE, &state), 0);
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#endif
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flush_stdout ();
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#ifdef _LIBC
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_IO_flockfile (stderr);
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#endif
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if (error_print_progname)
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(*error_print_progname) ();
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else
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{
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#if _LIBC
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__fxprintf (NULL, "%s: ", program_name);
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#else
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fprintf (stderr, "%s: ", program_name);
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#endif
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}
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va_start (args, message);
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error_tail (status, errnum, message, args);
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#ifdef _LIBC
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_IO_funlockfile (stderr);
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# ifdef __libc_ptf_call
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__libc_ptf_call (__pthread_setcancelstate, (state, NULL), 0);
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# endif
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#endif
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}
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/* Sometimes we want to have at most one error per line. This
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variable controls whether this mode is selected or not. */
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int error_one_per_line;
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void
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error_at_line (int status, int errnum, const char *file_name,
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unsigned int line_number, const char *message, ...)
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{
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va_list args;
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if (error_one_per_line)
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{
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static const char *old_file_name;
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static unsigned int old_line_number;
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if (old_line_number == line_number
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&& (file_name == old_file_name
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|| (old_file_name != NULL
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&& file_name != NULL
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&& strcmp (old_file_name, file_name) == 0)))
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/* Simply return and print nothing. */
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return;
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old_file_name = file_name;
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old_line_number = line_number;
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}
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#if defined _LIBC && defined __libc_ptf_call
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/* We do not want this call to be cut short by a thread
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cancellation. Therefore disable cancellation for now. */
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int state = PTHREAD_CANCEL_ENABLE;
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__libc_ptf_call (__pthread_setcancelstate,
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(PTHREAD_CANCEL_DISABLE, &state),
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0);
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#endif
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flush_stdout ();
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#ifdef _LIBC
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_IO_flockfile (stderr);
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#endif
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if (error_print_progname)
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(*error_print_progname) ();
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else
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{
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#if _LIBC
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__fxprintf (NULL, "%s:", program_name);
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#else
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fprintf (stderr, "%s:", program_name);
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#endif
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}
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#if _LIBC
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__fxprintf (NULL, file_name != NULL ? "%s:%d: " : " ",
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file_name, line_number);
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#else
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fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",
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file_name, line_number);
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#endif
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va_start (args, message);
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error_tail (status, errnum, message, args);
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#ifdef _LIBC
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_IO_funlockfile (stderr);
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# ifdef __libc_ptf_call
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__libc_ptf_call (__pthread_setcancelstate, (state, NULL), 0);
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# endif
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#endif
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}
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#ifdef _LIBC
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/* Make the weak alias. */
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# undef error
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# undef error_at_line
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weak_alias (__error, error)
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weak_alias (__error_at_line, error_at_line)
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#endif
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