diff options
Diffstat (limited to 'gettext-tools/gnulib-lib/pipe-filter-aux.h')
-rw-r--r-- | gettext-tools/gnulib-lib/pipe-filter-aux.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/gettext-tools/gnulib-lib/pipe-filter-aux.h b/gettext-tools/gnulib-lib/pipe-filter-aux.h new file mode 100644 index 0000000..8f2a707 --- /dev/null +++ b/gettext-tools/gnulib-lib/pipe-filter-aux.h @@ -0,0 +1,103 @@ +/* Auxiliary code for filtering of data through a subprocess. + Copyright (C) 2001-2003, 2008-2014 Free Software Foundation, Inc. + Written by Bruno Haible <haible@clisp.cons.org>, 2009. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#ifndef _GL_INLINE_HEADER_BEGIN + #error "Please include config.h first." +#endif +_GL_INLINE_HEADER_BEGIN +#ifndef PIPE_FILTER_AUX_INLINE +# define PIPE_FILTER_AUX_INLINE _GL_INLINE +#endif + +#ifndef SSIZE_MAX +# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2)) +#endif + +/* We use a child process, and communicate through a bidirectional pipe. + To avoid deadlocks, let the child process decide when it wants to read + or to write, and let the parent behave accordingly. The parent uses + select() to know whether it must write or read. On platforms without + select(), we use non-blocking I/O. (This means the parent is busy + looping while waiting for the child. Not good. But hardly any platform + lacks select() nowadays.) */ + +/* On BeOS select() works only on sockets, not on normal file descriptors. */ +#ifdef __BEOS__ +# undef HAVE_SELECT +#endif + +#ifdef EINTR + +/* EINTR handling for close(), read(), write(), select(). + These functions can return -1/EINTR even though we don't have any + signal handlers set up, namely when we get interrupted via SIGSTOP. */ + +PIPE_FILTER_AUX_INLINE int +nonintr_close (int fd) +{ + int retval; + + do + retval = close (fd); + while (retval < 0 && errno == EINTR); + + return retval; +} +#undef close /* avoid warning related to gnulib module unistd */ +#define close nonintr_close + +PIPE_FILTER_AUX_INLINE ssize_t +nonintr_read (int fd, void *buf, size_t count) +{ + ssize_t retval; + + do + retval = read (fd, buf, count); + while (retval < 0 && errno == EINTR); + + return retval; +} +#define read nonintr_read + +PIPE_FILTER_AUX_INLINE ssize_t +nonintr_write (int fd, const void *buf, size_t count) +{ + ssize_t retval; + + do + retval = write (fd, buf, count); + while (retval < 0 && errno == EINTR); + + return retval; +} +#undef write /* avoid warning on VMS */ +#define write nonintr_write + +#endif + +/* Non-blocking I/O. */ +#if HAVE_SELECT +# define IS_EAGAIN(errcode) 0 +#else +# ifdef EWOULDBLOCK +# define IS_EAGAIN(errcode) ((errcode) == EAGAIN || (errcode) == EWOULDBLOCK) +# else +# define IS_EAGAIN(errcode) ((errcode) == EAGAIN) +# endif +#endif + +_GL_INLINE_HEADER_END |