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/* Auxiliary code for filtering of data through a subprocess.
Copyright (C) 2001-2003, 2008-2023 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 <https://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
#if defined _WIN32 && ! defined __CYGWIN__
/* In the pipe-filter-* modules we want to use the write() function that is
not overridden to emulate SIGPIPE behaviour, because we don't want force
the caller to do
signal (SIGPIPE, SIG_DFL);
To reproduce the problem, use a gnulib testdir for the modules
'pipe-filter-gi', 'write', 'sigpipe'. */
# undef write
# define write _write
#endif
#ifndef SSIZE_MAX
# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
#endif
#ifdef _AIX
/* On AIX, despite having select() and despite having put the file descriptor
in non-blocking mode, it can happen that select() reports that fd[1] is
writable but writing a large amount of data to fd[1] then fails with errno
EAGAIN. Seen with test-pipe-filter-gi1 on AIX 7.2, with data sizes of
29 KB. So, limit the size of data passed to the write() call to 4 KB. */
# undef SSIZE_MAX
# define SSIZE_MAX 4096
#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 and OS/2 kLIBC select() works only on sockets, not on normal file
descriptors. */
#if defined __BEOS__ || defined __KLIBC__
# 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;
}
#undef read /* avoid warning related to gnulib module unistd */
#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
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