101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/* posix.c -- POSIX file I/O routines for the backtrace library.
|
|
Copyright (C) 2012-2014 Free Software Foundation, Inc.
|
|
Written by Ian Lance Taylor, Google.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
(1) Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
(2) Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
(3) The name of the author may not be used to
|
|
endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE. */
|
|
|
|
#include "config.h"
|
|
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include "backtrace.h"
|
|
#include "internal.h"
|
|
|
|
#ifndef O_BINARY
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
#ifndef O_CLOEXEC
|
|
#define O_CLOEXEC 0
|
|
#endif
|
|
|
|
#ifndef FD_CLOEXEC
|
|
#define FD_CLOEXEC 1
|
|
#endif
|
|
|
|
/* Open a file for reading. */
|
|
|
|
int
|
|
backtrace_open (const char *filename, backtrace_error_callback error_callback,
|
|
void *data, int *does_not_exist)
|
|
{
|
|
int descriptor;
|
|
|
|
if (does_not_exist != NULL)
|
|
*does_not_exist = 0;
|
|
|
|
descriptor = open (filename, O_RDONLY | O_BINARY | O_CLOEXEC);
|
|
if (descriptor < 0)
|
|
{
|
|
if (does_not_exist != NULL && errno == ENOENT)
|
|
*does_not_exist = 1;
|
|
else
|
|
error_callback (data, filename, errno);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef HAVE_FCNTL
|
|
/* Set FD_CLOEXEC just in case the kernel does not support
|
|
O_CLOEXEC. It doesn't matter if this fails for some reason.
|
|
FIXME: At some point it should be safe to only do this if
|
|
O_CLOEXEC == 0. */
|
|
fcntl (descriptor, F_SETFD, FD_CLOEXEC);
|
|
#endif
|
|
|
|
return descriptor;
|
|
}
|
|
|
|
/* Close DESCRIPTOR. */
|
|
|
|
int
|
|
backtrace_close (int descriptor, backtrace_error_callback error_callback,
|
|
void *data)
|
|
{
|
|
if (close (descriptor) < 0)
|
|
{
|
|
error_callback (data, "close", errno);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|