gnulib: lib/open.c annotate

annotate lib/open.c @ 40057:b06060465f09

maint: Run 'make update-copyright'

author	Paul Eggert <eggert@cs.ucla.edu>
date	Tue, 01 Jan 2019 00:25:11 +0100
parents	beb2ad957aca
children

rev	line source
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	1 /* Open a descriptor to a file.
40057 b06060465f09 maint: Run 'make update-copyright' Paul Eggert <eggert@cs.ucla.edu> parents: 19595 diff changeset	2 Copyright (C) 2007-2019 Free Software Foundation, Inc.
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	3
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 9299 diff changeset	4 This program is free software: you can redistribute it and/or modify
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	5 it under the terms of the GNU General Public License as published by
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 9299 diff changeset	6 the Free Software Foundation; either version 3 of the License, or
bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 9299 diff changeset	7 (at your option) any later version.
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	8
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	9 This program is distributed in the hope that it will be useful,
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	10 but WITHOUT ANY WARRANTY; without even the implied warranty of
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	12 GNU General Public License for more details.
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	13
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 9299 diff changeset	14 You should have received a copy of the GNU General Public License
19190 9759915b2aca all: prefer https: URLs Paul Eggert <eggert@cs.ucla.edu> parents: 19052 diff changeset	15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	16
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	18
15538 9fd857e43955 Avoid endless recursions if config.h includes some header files. Bruno Haible <bruno@clisp.org> parents: 14532 diff changeset	19 /* If the user's config.h happens to include <fcntl.h>, let it include only
9fd857e43955 Avoid endless recursions if config.h includes some header files. Bruno Haible <bruno@clisp.org> parents: 14532 diff changeset	20 the system's <fcntl.h> here, so that orig_open doesn't recurse to
9fd857e43955 Avoid endless recursions if config.h includes some header files. Bruno Haible <bruno@clisp.org> parents: 14532 diff changeset	21 rpl_open. */
9fd857e43955 Avoid endless recursions if config.h includes some header files. Bruno Haible <bruno@clisp.org> parents: 14532 diff changeset	22 #define __need_system_fcntl_h
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	23 #include <config.h>
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	24
10533 d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	25 /* Get the original definition of open. It might be defined as a macro. */
d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	26 #include <fcntl.h>
15538 9fd857e43955 Avoid endless recursions if config.h includes some header files. Bruno Haible <bruno@clisp.org> parents: 14532 diff changeset	27 #include <sys/types.h>
10533 d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	28 #undef __need_system_fcntl_h
d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	29
17185 dd46d4e6beea dup, execute, fatal-signal, etc.: no 'static inline' Paul Eggert <eggert@cs.ucla.edu> parents: 16201 diff changeset	30 static int
10533 d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	31 orig_open (const char *filename, int flags, mode_t mode)
d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	32 {
d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	33 return open (filename, flags, mode);
d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	34 }
d4b37870fdc9 Override open more carefully. Bruno Haible <bruno@clisp.org> parents: 10473 diff changeset	35
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	36 /* Specification. */
15583 716e67b8d5a9 openat: Work around compilation error with OSF/1 5.1 DTK cc. Bruno Haible <bruno@clisp.org> parents: 15538 diff changeset	37 /* Write "fcntl.h" here, not <fcntl.h>, otherwise OSF/1 5.1 DTK cc eliminates
716e67b8d5a9 openat: Work around compilation error with OSF/1 5.1 DTK cc. Bruno Haible <bruno@clisp.org> parents: 15538 diff changeset	38 this include because of the preliminary #include <fcntl.h> above. */
716e67b8d5a9 openat: Work around compilation error with OSF/1 5.1 DTK cc. Bruno Haible <bruno@clisp.org> parents: 15538 diff changeset	39 #include "fcntl.h"
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	40
19052 637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	41 #include "cloexec.h"
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	42
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	43 #include <errno.h>
9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	44 #include <stdarg.h>
9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	45 #include <string.h>
9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	46 #include <sys/types.h>
9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	47 #include <sys/stat.h>
11933 1ffad224c413 fchdir: use more consistent macro convention Eric Blake <ebb9@byu.net> parents: 11932 diff changeset	48 #include <unistd.h>
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	49
11922 9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	50 #ifndef REPLACE_OPEN_DIRECTORY
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	51 # define REPLACE_OPEN_DIRECTORY 0
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	52 #endif
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	53
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	54 int
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	55 open (const char *filename, int flags, ...)
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	56 {
19052 637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	57 /* 0 = unknown, 1 = yes, -1 = no. */
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	58 #if GNULIB_defined_O_CLOEXEC
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	59 int have_cloexec = -1;
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	60 #else
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	61 static int have_cloexec;
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	62 #endif
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	63
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	64 mode_t mode;
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	65 int fd;
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	66
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	67 mode = 0;
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	68 if (flags & O_CREAT)
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	69 {
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	70 va_list arg;
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	71 va_start (arg, flags);
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	72
11586 35f0931dc243 Simplify use of mode_t varargs. Bruno Haible <bruno@clisp.org> parents: 10608 diff changeset	73 /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	74 creates crashing code when 'mode_t' is smaller than 'int'. */
11586 35f0931dc243 Simplify use of mode_t varargs. Bruno Haible <bruno@clisp.org> parents: 10608 diff changeset	75 mode = va_arg (arg, PROMOTED_MODE_T);
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	76
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	77 va_end (arg);
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	78 }
ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	79
14532 0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	80 #if GNULIB_defined_O_NONBLOCK
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	81 /* The only known platform that lacks O_NONBLOCK is mingw, but it
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	82 also lacks named pipes and Unix sockets, which are the only two
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	83 file types that require non-blocking handling in open().
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	84 Therefore, it is safe to ignore O_NONBLOCK here. It is handy
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	85 that mingw also lacks openat(), so that is also covered here. */
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	86 flags &= ~O_NONBLOCK;
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	87 #endif
0b3f0c54fbc8 nonblocking: provide O_NONBLOCK for mingw Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	88
19595 beb2ad957aca Simplify code. Drop support for Borland C++ on Windows. Bruno Haible <bruno@clisp.org> parents: 19484 diff changeset	89 #if defined _WIN32 && ! defined __CYGWIN__
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	90 if (strcmp (filename, "/dev/null") == 0)
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	91 filename = "NUL";
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	92 #endif
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	93
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	94 #if OPEN_TRAILING_SLASH_BUG
10202 4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	95 /* If the filename ends in a slash and one of O_CREAT, O_WRONLY, O_RDWR
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	96 is specified, then fail.
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	97 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	98 says that
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	99 "A pathname that contains at least one non-slash character and that
10203 008f289e34ef Typo in comment. Bruno Haible <bruno@clisp.org> parents: 10202 diff changeset	100 ends with one or more trailing slashes shall be resolved as if a
10202 4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	101 single dot character ( '.' ) were appended to the pathname."
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	102 and
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	103 "The special filename dot shall refer to the directory specified by
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	104 its predecessor."
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	105 If the named file already exists as a directory, then
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	106 - if O_CREAT is specified, open() must fail because of the semantics
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	107 of O_CREAT,
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	108 - if O_WRONLY or O_RDWR is specified, open() must fail because POSIX
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	109 <http://www.opengroup.org/susv3/functions/open.html> says that it
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	110 fails with errno = EISDIR in this case.
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	111 If the named file does not exist or does not name a directory, then
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	112 - if O_CREAT is specified, open() must fail since open() cannot create
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	113 directories,
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	114 - if O_WRONLY or O_RDWR is specified, open() must fail because the
4d972085fd3a Add a comment. Bruno Haible <bruno@clisp.org> parents: 10201 diff changeset	115 file does not contain a '.' directory. */
10201 270b7afb8fb7 Work around open() bug on HP-UX 11 and Solaris 9. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	116 if (flags & (O_CREAT \| O_WRONLY \| O_RDWR))
270b7afb8fb7 Work around open() bug on HP-UX 11 and Solaris 9. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	117 {
270b7afb8fb7 Work around open() bug on HP-UX 11 and Solaris 9. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	118 size_t len = strlen (filename);
270b7afb8fb7 Work around open() bug on HP-UX 11 and Solaris 9. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	119 if (len > 0 && filename[len - 1] == '/')
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	120 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	121 errno = EISDIR;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	122 return -1;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	123 }
10201 270b7afb8fb7 Work around open() bug on HP-UX 11 and Solaris 9. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	124 }
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	125 #endif
10201 270b7afb8fb7 Work around open() bug on HP-UX 11 and Solaris 9. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	126
19052 637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	127 fd = orig_open (filename,
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	128 flags & ~(have_cloexec <= 0 ? O_CLOEXEC : 0), mode);
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	129
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	130 if (flags & O_CLOEXEC)
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	131 {
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	132 if (! have_cloexec)
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	133 {
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	134 if (0 <= fd)
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	135 have_cloexec = 1;
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	136 else if (errno == EINVAL)
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	137 {
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	138 fd = orig_open (filename, flags & ~O_CLOEXEC, mode);
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	139 have_cloexec = -1;
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	140 }
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	141 }
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	142 if (have_cloexec < 0 && 0 <= fd)
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	143 set_cloexec_flag (fd, true);
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	144 }
637f3a63efbd open: support O_CLOEXEC Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	145
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	146
11933 1ffad224c413 fchdir: use more consistent macro convention Eric Blake <ebb9@byu.net> parents: 11932 diff changeset	147 #if REPLACE_FCHDIR
11922 9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	148 /* Implementing fchdir and fdopendir requires the ability to open a
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	149 directory file descriptor. If open doesn't support that (as on
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	150 mingw), we use a dummy file that behaves the same as directories
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	151 on Linux (ie. always reports EOF on attempts to read()), and
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	152 override fstat() in fchdir.c to hide the fact that we have a
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	153 dummy. */
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	154 if (REPLACE_OPEN_DIRECTORY && fd < 0 && errno == EACCES
13664 241057e2e60f fcntl-h: define O_CLOEXEC and O_EXEC if not defined; use new defines Paul Eggert <eggert@cs.ucla.edu> parents: 12559 diff changeset	155 && ((flags & O_ACCMODE) == O_RDONLY
241057e2e60f fcntl-h: define O_CLOEXEC and O_EXEC if not defined; use new defines Paul Eggert <eggert@cs.ucla.edu> parents: 12559 diff changeset	156 \|\| (O_SEARCH != O_RDONLY && (flags & O_ACCMODE) == O_SEARCH)))
11922 9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	157 {
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	158 struct stat statbuf;
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	159 if (stat (filename, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	160 {
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	161 /* Maximum recursion depth of 1. */
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	162 fd = open ("/dev/null", flags, mode);
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	163 if (0 <= fd)
11932 4073da4a848c fchdir: simplify error handling, and support dup3 Eric Blake <ebb9@byu.net> parents: 11922 diff changeset	164 fd = _gl_register_fd (fd, filename);
11922 9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	165 }
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	166 else
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	167 errno = EACCES;
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	168 }
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	169 #endif
9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	170
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	171 #if OPEN_TRAILING_SLASH_BUG
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	172 /* If the filename ends in a slash and fd does not refer to a directory,
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	173 then fail.
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	174 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	175 says that
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	176 "A pathname that contains at least one non-slash character and that
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	177 ends with one or more trailing slashes shall be resolved as if a
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	178 single dot character ( '.' ) were appended to the pathname."
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	179 and
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	180 "The special filename dot shall refer to the directory specified by
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	181 its predecessor."
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	182 If the named file without the slash is not a directory, open() must fail
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	183 with ENOTDIR. */
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	184 if (fd >= 0)
a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	185 {
12052 7891d97ab77c open, openat: minor optimization Eric Blake <ebb9@byu.net> parents: 11933 diff changeset	186 /* We know len is positive, since open did not fail with ENOENT. */
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	187 size_t len = strlen (filename);
12052 7891d97ab77c open, openat: minor optimization Eric Blake <ebb9@byu.net> parents: 11933 diff changeset	188 if (filename[len - 1] == '/')
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	189 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	190 struct stat statbuf;
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	191
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	192 if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	193 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	194 close (fd);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	195 errno = ENOTDIR;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	196 return -1;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	197 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12106 diff changeset	198 }
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	199 }
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	200 #endif
9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	201
11933 1ffad224c413 fchdir: use more consistent macro convention Eric Blake <ebb9@byu.net> parents: 11932 diff changeset	202 #if REPLACE_FCHDIR
11922 9750527ffbab fchdir: port to mingw Eric Blake <ebb9@byu.net> parents: 11586 diff changeset	203 if (!REPLACE_OPEN_DIRECTORY && 0 <= fd)
11932 4073da4a848c fchdir: simplify error handling, and support dup3 Eric Blake <ebb9@byu.net> parents: 11922 diff changeset	204 fd = _gl_register_fd (fd, filename);
10608 9559d8f05cdb Merge the two replacements for open() into a single one. Paolo Bonzini <bonzini@gnu.org> parents: 10533 diff changeset	205 #endif
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	206
10472 a4dc39a18d54 Ensure that a filename ending in a slash cannot be used to access a non-directory. Bruno Haible <bruno@clisp.org> parents: 10203 diff changeset	207 return fd;
9299 ada4d73c37a6 New module 'open'. Bruno Haible <bruno@clisp.org> parents: diff changeset	208 }

Mercurial > gnulib

annotate lib/open.c @ 40057:b06060465f09