105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
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/* posix.c -- POSIX file I/O routines for the backtrace library.
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Copyright (C) 2012-2021 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Google.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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(1) Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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(2) Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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(3) The name of the author may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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#include "config.h"
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "backtrace.h"
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#include "internal.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#ifndef O_CLOEXEC
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#define O_CLOEXEC 0
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#endif
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#ifndef FD_CLOEXEC
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#define FD_CLOEXEC 1
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#endif
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/* Open a file for reading. */
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int
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backtrace_open (const char *filename, backtrace_error_callback error_callback,
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void *data, int *does_not_exist)
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{
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int descriptor;
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if (does_not_exist != NULL)
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*does_not_exist = 0;
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descriptor = open (filename, (int) (O_RDONLY | O_BINARY | O_CLOEXEC));
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if (descriptor < 0)
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{
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/* If DOES_NOT_EXIST is not NULL, then don't call ERROR_CALLBACK
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if the file does not exist. We treat lacking permission to
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open the file as the file not existing; this case arises when
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running the libgo syscall package tests as root. */
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if (does_not_exist != NULL && (errno == ENOENT || errno == EACCES))
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*does_not_exist = 1;
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else
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error_callback (data, filename, errno);
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return -1;
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}
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#ifdef HAVE_FCNTL
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/* Set FD_CLOEXEC just in case the kernel does not support
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O_CLOEXEC. It doesn't matter if this fails for some reason.
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FIXME: At some point it should be safe to only do this if
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O_CLOEXEC == 0. */
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fcntl (descriptor, F_SETFD, FD_CLOEXEC);
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#endif
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return descriptor;
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}
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/* Close DESCRIPTOR. */
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int
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backtrace_close (int descriptor, backtrace_error_callback error_callback,
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void *data)
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{
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if (close (descriptor) < 0)
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{
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error_callback (data, "close", errno);
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return 0;
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}
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return 1;
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}
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