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annotate lib/fopen.c @ 17185:dd46d4e6beea

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dup, execute, fatal-signal, etc.: no 'static inline' * lib/dup.c (dup_nothrow): * lib/execute.c (nonintr_close, nonintr_open): * lib/fatal-signal.c (uninstall_handlers, install_handlers): * lib/fopen.c (orig_fopen): * lib/freadseek.c (freadptrinc): * lib/freopen.c (orig_freopen): * lib/fstat.c (orig_fstat, fstat_nothrow): * lib/get-rusage-as.c (get_rusage_as_via_setrlimit) (get_rusage_as_via_iterator): * lib/get-rusage-data.c (get_rusage_data_via_setrlimit): * lib/getdtablesize.c (_setmaxstdio_nothrow): * lib/isatty.c (_isatty_nothrow): * lib/open.c (orig_open): * lib/read.c (read_nothrow): * lib/sigprocmask.c (signal_nothrow): * lib/spawn-pipe.c (nonintr_close, nonintr_open): * lib/vasnprintf.c (MAX_ROOM_NEEDED): * lib/wait-process.c (unregister_slave_subprocess): * lib/write.c (write_nothrow): Now static, not static inline. * lib/spawn-pipe.c (nonintr_open): Define only if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__. * m4/dup.m4 (gl_PREREQ_DUP): * m4/execute.m4 (gl_EXECUTE): * m4/fatal-signal.m4 (gl_FATAL_SIGNAL): * m4/fopen.m4 (gl_PREREQ_FOPEN): * m4/freadseek.m4 (gl_FUNC_FREADSEEK): * m4/freopen.m4 (gl_PREREQ_FREOPEN): * m4/fstat.m4 (gl_PREREQ_FSTAT): * m4/getdtablesize.m4 (gl_PREREQ_GETDTABLESIZE): * m4/isatty.m4 (gl_PREREQ_ISATTY): * m4/open.m4 (gl_PREREQ_OPEN): * m4/read.m4 (gl_PREREQ_READ): * m4/signalblocking.m4 (gl_PREREQ_SIGPROCMASK): * m4/spawn-pipe.m4 (gl_SPAWN_PIPE): * m4/vasnprintf.m4 (gl_PREREQ_VASNPRINTF): * m4/wait-process.m4 (gl_WAIT_PROCESS): * m4/write.m4 (gl_PREREQ_WRITE): * modules/get-rusage-as, modules/get-rusage-data (configure.ac): Do not require AC_C_INLINE.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 20 Nov 2012 22:25:09 -0800
parents 8250f2777afc
children e542fd46ad6f
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1 /* Open a stream to a file.
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2 Copyright (C) 2007-2012 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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18
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19 /* If the user's config.h happens to include <stdio.h>, let it include only
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20 the system's <stdio.h> here, so that orig_fopen doesn't recurse to
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21 rpl_fopen. */
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22 #define __need_FILE
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23 #include <config.h>
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24
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25 /* Get the original definition of fopen. It might be defined as a macro. */
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26 #include <stdio.h>
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27 #undef __need_FILE
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28
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29 static FILE *
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30 orig_fopen (const char *filename, const char *mode)
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31 {
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32 return fopen (filename, mode);
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33 }
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34
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35 /* Specification. */
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36 /* Write "stdio.h" here, not <stdio.h>, otherwise OSF/1 5.1 DTK cc eliminates
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37 this include because of the preliminary #include <stdio.h> above. */
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38 #include "stdio.h"
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39
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40 #include <errno.h>
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41 #include <fcntl.h>
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42 #include <string.h>
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43 #include <unistd.h>
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44 #include <sys/types.h>
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45 #include <sys/stat.h>
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47 FILE *
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48 rpl_fopen (const char *filename, const char *mode)
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49 {
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50 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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51 if (strcmp (filename, "/dev/null") == 0)
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52 filename = "NUL";
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53 #endif
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54
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55 #if FOPEN_TRAILING_SLASH_BUG
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56 /* If the filename ends in a slash and a mode that requires write access is
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57 specified, then fail.
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58 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
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59 says that
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60 "A pathname that contains at least one non-slash character and that
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61 ends with one or more trailing slashes shall be resolved as if a
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62 single dot character ( '.' ) were appended to the pathname."
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63 and
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64 "The special filename dot shall refer to the directory specified by
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65 its predecessor."
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66 If the named file already exists as a directory, then if a mode that
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67 requires write access is specified, fopen() must fail because POSIX
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68 <http://www.opengroup.org/susv3/functions/fopen.html> says that it
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69 fails with errno = EISDIR in this case.
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70 If the named file does not exist or does not name a directory, then
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71 fopen() must fail since the file does not contain a '.' directory. */
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72 {
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73 size_t len = strlen (filename);
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74 if (len > 0 && filename[len - 1] == '/')
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75 {
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76 int fd;
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77 struct stat statbuf;
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78 FILE *fp;
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79
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80 if (mode[0] == 'w' || mode[0] == 'a')
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81 {
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82 errno = EISDIR;
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83 return NULL;
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84 }
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85
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86 fd = open (filename, O_RDONLY);
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87 if (fd < 0)
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88 return NULL;
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89
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90 if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
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91 {
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92 close (fd);
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93 errno = ENOTDIR;
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94 return NULL;
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95 }
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96
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97 fp = fdopen (fd, mode);
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98 if (fp == NULL)
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99 {
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100 int saved_errno = errno;
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101 close (fd);
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102 errno = saved_errno;
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103 }
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104 return fp;
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105 }
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106 }
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107 # endif
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108
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109 return orig_fopen (filename, mode);
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110 }