Mercurial > hg > octave-jordi > gnulib-hg
annotate lib/nonblocking.c @ 14532:0b3f0c54fbc8
nonblocking: provide O_NONBLOCK for mingw
Mingw is the only known platform that lacks O_NONBLOCK (possibly
via the alternate spelling O_NDELAY). But mingw also lacks any
files where open() needs to enforce non-blocking behavior, and
lacks openat(), so it is relatively simple to provide a non-zero
flag. A future patches will make use of O_NONBLOCK for pipe2.
* modules/nonblocking (Depends-on): Add open.
(configure.ac): Set new witness macro.
* m4/fcntl_h.m4 (gl_FCNTL_H_DEFAULTS): Provide default for it.
* modules/fcntl-h (Makefile.am): Substitute it.
* lib/fcntl.in.h (O_NONBLOCK): Guarantee non-zero definition when
nonblocking module is in use.
* lib/nonblocking.c: Adjust portability test.
* lib/open.c (open): Don't let native open see gnulib flag.
* tests/test-fcntl-h.c (main): Enhance test.
* tests/test-open.h (test_open): Likewise.
* doc/posix-headers/fcntl.texi (fcntl.h): Document the replacement.
Signed-off-by: Eric Blake <eblake@redhat.com>
| author | Eric Blake <eblake@redhat.com> |
|---|---|
| date | Fri, 08 Apr 2011 10:15:54 -0600 |
| parents | 8b5a7d072ac7 |
| children | b86e9061a6d0 |
| rev | line source |
|---|---|
| 14513 | 1 /* Non-blocking I/O for pipe or socket descriptors. |
| 2 Copyright (C) 2011 Free Software Foundation, Inc. | |
| 3 | |
| 4 This program is free software: you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 3 of the License, or | |
| 7 (at your option) any later version. | |
| 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 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 16 | |
| 17 #include <config.h> | |
| 18 | |
| 19 /* Specification. */ | |
| 20 #include "nonblocking.h" | |
| 21 | |
| 22 #include <errno.h> | |
| 23 | |
| 24 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
| 25 /* Native Woe32 API. */ | |
| 26 | |
|
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27 # include <sys/ioctl.h> |
| 14513 | 28 # include <sys/socket.h> |
| 29 # include <unistd.h> | |
| 30 | |
| 31 /* Get declarations of the Win32 API functions. */ | |
| 32 # define WIN32_LEAN_AND_MEAN | |
| 33 # include <windows.h> | |
| 34 | |
| 35 int | |
| 36 get_nonblocking_flag (int desc) | |
| 37 { | |
| 38 HANDLE h = (HANDLE) _get_osfhandle (desc); | |
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39 if (h == INVALID_HANDLE_VALUE) |
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40 { |
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41 errno = EBADF; |
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42 return -1; |
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43 } |
| 14513 | 44 if (GetFileType (h) == FILE_TYPE_PIPE) |
| 45 { | |
| 46 /* h is a pipe or socket. */ | |
| 47 DWORD state; | |
| 48 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0)) | |
| 49 /* h is a pipe. */ | |
| 50 return (state & PIPE_NOWAIT) != 0; | |
| 51 else | |
| 52 /* h is a socket. */ | |
| 53 errno = ENOSYS; | |
| 54 return -1; | |
| 55 } | |
| 56 else | |
| 57 /* Win32 does not support non-blocking on regular files. */ | |
| 58 return 0; | |
| 59 } | |
| 60 | |
| 61 int | |
| 62 set_nonblocking_flag (int desc, bool value) | |
| 63 { | |
| 64 HANDLE h = (HANDLE) _get_osfhandle (desc); | |
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65 if (h == INVALID_HANDLE_VALUE) |
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66 { |
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67 errno = EBADF; |
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68 return -1; |
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69 } |
| 14513 | 70 if (GetFileType (h) == FILE_TYPE_PIPE) |
| 71 { | |
| 72 /* h is a pipe or socket. */ | |
| 73 DWORD state; | |
| 74 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0)) | |
| 75 { | |
| 76 /* h is a pipe. */ | |
| 77 if ((state & PIPE_NOWAIT) != 0) | |
| 78 { | |
| 79 if (value) | |
| 80 return 0; | |
| 81 state &= ~PIPE_NOWAIT; | |
| 82 } | |
| 83 else | |
| 84 { | |
| 85 if (!value) | |
| 86 return 0; | |
| 87 state |= PIPE_NOWAIT; | |
| 88 } | |
| 89 if (SetNamedPipeHandleState (h, &state, NULL, NULL)) | |
| 90 return 0; | |
| 91 errno = EINVAL; | |
| 92 return -1; | |
| 93 } | |
| 94 else | |
| 95 { | |
| 96 /* h is a socket. */ | |
| 97 int v = value; | |
| 98 return ioctl (desc, FIONBIO, &v); | |
| 99 } | |
| 100 } | |
| 101 else | |
| 102 { | |
| 103 /* Win32 does not support non-blocking on regular files. */ | |
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104 if (!value) |
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105 return 0; |
| 14513 | 106 errno = ENOTSUP; |
| 107 return -1; | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 #else | |
| 112 /* Unix API. */ | |
| 113 | |
| 114 # include <fcntl.h> | |
| 115 | |
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116 # if GNULIB_defined_O_NONBLOCK |
| 14513 | 117 # error Please port nonblocking to your platform |
| 118 # endif | |
| 119 | |
| 120 /* We don't need the gnulib replacement of fcntl() here. */ | |
| 121 # undef fcntl | |
| 122 | |
| 123 int | |
| 124 get_nonblocking_flag (int desc) | |
| 125 { | |
| 126 int fcntl_flags; | |
| 127 | |
| 128 fcntl_flags = fcntl (desc, F_GETFL, 0); | |
| 129 if (fcntl_flags < 0) | |
| 130 return -1; | |
| 131 return (fcntl_flags & O_NONBLOCK) != 0; | |
| 132 } | |
| 133 | |
| 134 int | |
| 135 set_nonblocking_flag (int desc, bool value) | |
| 136 { | |
| 137 int fcntl_flags; | |
| 138 | |
| 139 fcntl_flags = fcntl (desc, F_GETFL, 0); | |
| 140 if (fcntl_flags < 0) | |
| 141 return -1; | |
| 142 if (((fcntl_flags & O_NONBLOCK) != 0) == value) | |
| 143 return 0; | |
| 144 if (value) | |
| 145 fcntl_flags |= O_NONBLOCK; | |
| 146 else | |
| 147 fcntl_flags &= ~O_NONBLOCK; | |
| 148 return fcntl (desc, F_SETFL, fcntl_flags); | |
| 149 } | |
| 150 | |
| 151 #endif |