Ian Lance Taylor | eff02e4 | 2012-09-17 16:38:38 +0000 | [diff] [blame] | 1 | /* posix.c -- POSIX file I/O routines for the backtrace library. |
| 2 | Copyright (C) 2012 Free Software Foundation, Inc. |
| 3 | Written by Ian Lance Taylor, Google. |
| 4 | |
| 5 | Redistribution and use in source and binary forms, with or without |
| 6 | modification, are permitted provided that the following conditions are |
| 7 | met: |
| 8 | |
| 9 | (1) Redistributions of source code must retain the above copyright |
| 10 | notice, this list of conditions and the following disclaimer. |
| 11 | |
| 12 | (2) Redistributions in binary form must reproduce the above copyright |
| 13 | notice, this list of conditions and the following disclaimer in |
| 14 | the documentation and/or other materials provided with the |
| 15 | distribution. |
| 16 | |
| 17 | (3) The name of the author may not be used to |
| 18 | endorse or promote products derived from this software without |
| 19 | specific prior written permission. |
| 20 | |
| 21 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 22 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 23 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| 25 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 26 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 27 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 29 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 30 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 31 | POSSIBILITY OF SUCH DAMAGE. */ |
| 32 | |
| 33 | #include "config.h" |
| 34 | |
| 35 | #include <errno.h> |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/stat.h> |
| 38 | #include <fcntl.h> |
| 39 | #include <unistd.h> |
| 40 | |
| 41 | #include "backtrace.h" |
| 42 | #include "internal.h" |
| 43 | |
Ian Lance Taylor | 3319ef1 | 2012-09-18 18:06:28 +0000 | [diff] [blame^] | 44 | #ifndef O_BINARY |
| 45 | #define O_BINARY 0 |
| 46 | #endif |
| 47 | |
Ian Lance Taylor | eff02e4 | 2012-09-17 16:38:38 +0000 | [diff] [blame] | 48 | #ifndef O_CLOEXEC |
| 49 | #define O_CLOEXEC 0 |
| 50 | #endif |
| 51 | |
| 52 | #ifndef FD_CLOEXEC |
| 53 | #define FD_CLOEXEC 1 |
| 54 | #endif |
| 55 | |
| 56 | /* Open a file for reading. */ |
| 57 | |
| 58 | int |
| 59 | backtrace_open (const char *filename, backtrace_error_callback error_callback, |
| 60 | void *data) |
| 61 | { |
| 62 | int descriptor; |
| 63 | |
Ian Lance Taylor | 3319ef1 | 2012-09-18 18:06:28 +0000 | [diff] [blame^] | 64 | descriptor = open (filename, O_RDONLY | O_BINARY | O_CLOEXEC); |
Ian Lance Taylor | eff02e4 | 2012-09-17 16:38:38 +0000 | [diff] [blame] | 65 | if (descriptor < 0) |
| 66 | { |
| 67 | error_callback (data, filename, errno); |
| 68 | return -1; |
| 69 | } |
| 70 | |
Ian Lance Taylor | 3319ef1 | 2012-09-18 18:06:28 +0000 | [diff] [blame^] | 71 | #ifdef HAVE_FCNTL |
Ian Lance Taylor | eff02e4 | 2012-09-17 16:38:38 +0000 | [diff] [blame] | 72 | /* Set FD_CLOEXEC just in case the kernel does not support |
| 73 | O_CLOEXEC. It doesn't matter if this fails for some reason. |
| 74 | FIXME: At some point it should be safe to only do this if |
| 75 | O_CLOEXEC == 0. */ |
| 76 | fcntl (descriptor, F_SETFD, FD_CLOEXEC); |
Ian Lance Taylor | 3319ef1 | 2012-09-18 18:06:28 +0000 | [diff] [blame^] | 77 | #endif |
Ian Lance Taylor | eff02e4 | 2012-09-17 16:38:38 +0000 | [diff] [blame] | 78 | |
| 79 | return descriptor; |
| 80 | } |
| 81 | |
| 82 | /* Close DESCRIPTOR. */ |
| 83 | |
| 84 | int |
| 85 | backtrace_close (int descriptor, backtrace_error_callback error_callback, |
| 86 | void *data) |
| 87 | { |
| 88 | if (close (descriptor) < 0) |
| 89 | { |
| 90 | error_callback (data, "close", errno); |
| 91 | return 0; |
| 92 | } |
| 93 | return 1; |
| 94 | } |