Mercurial > gnulib
annotate lib/pipe-filter-aux.h @ 40057:b06060465f09
maint: Run 'make update-copyright'
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 01 Jan 2019 00:25:11 +0100 |
| parents | 10eb9086bea0 |
| children |
| rev | line source |
|---|---|
| 11758 | 1 /* Auxiliary code for filtering of data through a subprocess. |
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Paul Eggert <eggert@cs.ucla.edu>
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2 Copyright (C) 2001-2003, 2008-2019 Free Software Foundation, Inc. |
| 11758 | 3 Written by Bruno Haible <haible@clisp.cons.org>, 2009. |
| 4 | |
| 5 This program is free software: you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 3 of the License, or | |
| 8 (at your option) any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 19190 | 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 11758 | 17 |
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18 #ifndef _GL_INLINE_HEADER_BEGIN |
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19 #error "Please include config.h first." |
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20 #endif |
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21 _GL_INLINE_HEADER_BEGIN |
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22 #ifndef PIPE_FILTER_AUX_INLINE |
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23 # define PIPE_FILTER_AUX_INLINE _GL_INLINE |
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24 #endif |
| 11758 | 25 |
| 26 #ifndef SSIZE_MAX | |
| 27 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2)) | |
| 28 #endif | |
| 29 | |
| 30 /* We use a child process, and communicate through a bidirectional pipe. | |
| 31 To avoid deadlocks, let the child process decide when it wants to read | |
| 32 or to write, and let the parent behave accordingly. The parent uses | |
| 33 select() to know whether it must write or read. On platforms without | |
| 34 select(), we use non-blocking I/O. (This means the parent is busy | |
| 35 looping while waiting for the child. Not good. But hardly any platform | |
| 36 lacks select() nowadays.) */ | |
| 37 | |
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38 /* On BeOS and OS/2 kLIBC select() works only on sockets, not on normal file |
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39 descriptors. */ |
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40 #if defined __BEOS__ || defined __KLIBC__ |
| 11758 | 41 # undef HAVE_SELECT |
| 42 #endif | |
| 43 | |
| 44 #ifdef EINTR | |
| 45 | |
| 46 /* EINTR handling for close(), read(), write(), select(). | |
| 47 These functions can return -1/EINTR even though we don't have any | |
| 48 signal handlers set up, namely when we get interrupted via SIGSTOP. */ | |
| 49 | |
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50 PIPE_FILTER_AUX_INLINE int |
| 11758 | 51 nonintr_close (int fd) |
| 52 { | |
| 53 int retval; | |
| 54 | |
| 55 do | |
| 56 retval = close (fd); | |
| 57 while (retval < 0 && errno == EINTR); | |
| 58 | |
| 59 return retval; | |
| 60 } | |
| 61 #undef close /* avoid warning related to gnulib module unistd */ | |
| 62 #define close nonintr_close | |
| 63 | |
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64 PIPE_FILTER_AUX_INLINE ssize_t |
| 11758 | 65 nonintr_read (int fd, void *buf, size_t count) |
| 66 { | |
| 67 ssize_t retval; | |
| 68 | |
| 69 do | |
| 70 retval = read (fd, buf, count); | |
| 71 while (retval < 0 && errno == EINTR); | |
| 72 | |
| 73 return retval; | |
| 74 } | |
| 75 #define read nonintr_read | |
| 76 | |
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77 PIPE_FILTER_AUX_INLINE ssize_t |
| 11758 | 78 nonintr_write (int fd, const void *buf, size_t count) |
| 79 { | |
| 80 ssize_t retval; | |
| 81 | |
| 82 do | |
| 83 retval = write (fd, buf, count); | |
| 84 while (retval < 0 && errno == EINTR); | |
| 85 | |
| 86 return retval; | |
| 87 } | |
| 88 #undef write /* avoid warning on VMS */ | |
| 89 #define write nonintr_write | |
| 90 | |
| 91 #endif | |
| 92 | |
| 93 /* Non-blocking I/O. */ | |
| 94 #if HAVE_SELECT | |
| 95 # define IS_EAGAIN(errcode) 0 | |
| 96 #else | |
| 97 # ifdef EWOULDBLOCK | |
| 98 # define IS_EAGAIN(errcode) ((errcode) == EAGAIN || (errcode) == EWOULDBLOCK) | |
| 99 # else | |
| 100 # define IS_EAGAIN(errcode) ((errcode) == EAGAIN) | |
| 101 # endif | |
| 102 #endif | |
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103 |
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104 _GL_INLINE_HEADER_END |