Mercurial > gnulib
annotate lib/open.c @ 10202:4d972085fd3a
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| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Thu, 12 Jun 2008 13:47:37 +0200 |
| parents | 270b7afb8fb7 |
| children | 008f289e34ef |
| rev | line source |
|---|---|
| 9299 | 1 /* Open a descriptor to a file. |
|
10201
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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2 Copyright (C) 2007-2008 Free Software Foundation, Inc. |
| 9299 | 3 |
|
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
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4 This program is free software: you can redistribute it and/or modify |
| 9299 | 5 it under the terms of the GNU General Public License as published by |
|
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
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diff
changeset
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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>
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7 (at your option) any later version. |
| 9299 | 8 |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
|
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
parents:
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14 You should have received a copy of the GNU General Public License |
|
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 9299 | 16 |
| 17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */ | |
| 18 | |
| 19 #include <config.h> | |
| 20 | |
| 21 /* Specification. */ | |
| 22 #include <fcntl.h> | |
| 23 | |
| 24 /* If the fchdir replacement is used, open() is defined in fchdir.c. */ | |
| 25 #ifndef FCHDIR_REPLACEMENT | |
| 26 | |
|
10201
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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27 # include <errno.h> |
| 9299 | 28 # include <stdarg.h> |
| 29 # include <string.h> | |
| 30 # include <sys/types.h> | |
| 31 # include <sys/stat.h> | |
| 32 | |
| 33 int | |
| 34 open (const char *filename, int flags, ...) | |
| 35 # undef open | |
| 36 { | |
| 37 mode_t mode; | |
| 38 | |
| 39 mode = 0; | |
| 40 if (flags & O_CREAT) | |
| 41 { | |
| 42 va_list arg; | |
| 43 va_start (arg, flags); | |
| 44 | |
| 45 /* If mode_t is narrower than int, use the promoted type (int), | |
| 46 not mode_t. Use sizeof to guess whether mode_t is narrower; | |
| 47 we don't know of any practical counterexamples. */ | |
| 48 mode = (sizeof (mode_t) < sizeof (int) | |
| 49 ? va_arg (arg, int) | |
| 50 : va_arg (arg, mode_t)); | |
| 51 | |
| 52 va_end (arg); | |
| 53 } | |
| 54 | |
|
10201
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
55 # if OPEN_TRAILING_SLASH_BUG |
| 10202 | 56 /* If the filename ends in a slash and one of O_CREAT, O_WRONLY, O_RDWR |
| 57 is specified, then fail. | |
| 58 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html> | |
| 59 says that | |
| 60 "A pathname that contains at least one non-slash character and that | |
| 61 ends withone or more trailing slashes shall be resolved as if a | |
| 62 single dot character ( '.' ) were appended to the pathname." | |
| 63 and | |
| 64 "The special filename dot shall refer to the directory specified by | |
| 65 its predecessor." | |
| 66 If the named file already exists as a directory, then | |
| 67 - if O_CREAT is specified, open() must fail because of the semantics | |
| 68 of O_CREAT, | |
| 69 - if O_WRONLY or O_RDWR is specified, open() must fail because POSIX | |
| 70 <http://www.opengroup.org/susv3/functions/open.html> says that it | |
| 71 fails with errno = EISDIR in this case. | |
| 72 If the named file does not exist or does not name a directory, then | |
| 73 - if O_CREAT is specified, open() must fail since open() cannot create | |
| 74 directories, | |
| 75 - if O_WRONLY or O_RDWR is specified, open() must fail because the | |
| 76 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
|
77 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
|
78 { |
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270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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79 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
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80 if (len > 0 && filename[len - 1] == '/') |
|
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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81 { |
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270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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82 errno = EISDIR; |
|
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
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83 return -1; |
|
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
84 } |
|
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
85 } |
|
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
86 # endif |
|
270b7afb8fb7
Work around open() bug on HP-UX 11 and Solaris 9.
Bruno Haible <bruno@clisp.org>
parents:
9309
diff
changeset
|
87 |
| 9299 | 88 # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
| 89 if (strcmp (filename, "/dev/null") == 0) | |
| 90 filename = "NUL"; | |
| 91 # endif | |
| 92 | |
| 93 return open (filename, flags, mode); | |
| 94 } | |
| 95 #endif |