diff options
Diffstat (limited to 'lib/pipe2.c')
| -rw-r--r-- | lib/pipe2.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/lib/pipe2.c b/lib/pipe2.c deleted file mode 100644 index 5925cf9e..00000000 --- a/lib/pipe2.c +++ /dev/null @@ -1,168 +0,0 @@ -/* Create a pipe, with specific opening flags. - Copyright (C) 2009-2013 Free Software Foundation, Inc. - - 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, 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/>. */ - -#include <config.h> - -/* Specification. */ -#include <unistd.h> - -#include <errno.h> -#include <fcntl.h> - -#include "binary-io.h" -#include "verify.h" - -#if GNULIB_defined_O_NONBLOCK -# include "nonblocking.h" -#endif - -#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ -/* Native Windows API. */ - -# include <io.h> - -#endif - -int -pipe2 (int fd[2], int flags) -{ - /* Mingw _pipe() corrupts fd on failure; also, if we succeed at - creating the pipe but later fail at changing fcntl, we want - to leave fd unchanged: http://austingroupbugs.net/view.php?id=467 */ - int tmp[2]; - tmp[0] = fd[0]; - tmp[1] = fd[1]; - -#if HAVE_PIPE2 -# undef pipe2 - /* Try the system call first, if it exists. (We may be running with a glibc - that has the function but with an older kernel that lacks it.) */ - { - /* Cache the information whether the system call really exists. */ - static int have_pipe2_really; /* 0 = unknown, 1 = yes, -1 = no */ - if (have_pipe2_really >= 0) - { - int result = pipe2 (fd, flags); - if (!(result < 0 && errno == ENOSYS)) - { - have_pipe2_really = 1; - return result; - } - have_pipe2_really = -1; - } - } -#endif - - /* Check the supported flags. */ - if ((flags & ~(O_CLOEXEC | O_NONBLOCK | O_BINARY | O_TEXT)) != 0) - { - errno = EINVAL; - return -1; - } - -#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ -/* Native Windows API. */ - - if (_pipe (fd, 4096, flags & ~O_NONBLOCK) < 0) - { - fd[0] = tmp[0]; - fd[1] = tmp[1]; - return -1; - } - - /* O_NONBLOCK handling. - On native Windows platforms, O_NONBLOCK is defined by gnulib. Use the - functions defined by the gnulib module 'nonblocking'. */ -# if GNULIB_defined_O_NONBLOCK - if (flags & O_NONBLOCK) - { - if (set_nonblocking_flag (fd[0], true) != 0 - || set_nonblocking_flag (fd[1], true) != 0) - goto fail; - } -# else - { - verify (O_NONBLOCK == 0); - } -# endif - - return 0; - -#else -/* Unix API. */ - - if (pipe (fd) < 0) - return -1; - - /* POSIX <http://www.opengroup.org/onlinepubs/9699919799/functions/pipe.html> - says that initially, the O_NONBLOCK and FD_CLOEXEC flags are cleared on - both fd[0] and fd[1]. */ - - /* O_NONBLOCK handling. - On Unix platforms, O_NONBLOCK is defined by the system. Use fcntl(). */ - if (flags & O_NONBLOCK) - { - int fcntl_flags; - - if ((fcntl_flags = fcntl (fd[1], F_GETFL, 0)) < 0 - || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1 - || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0 - || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1) - goto fail; - } - - if (flags & O_CLOEXEC) - { - int fcntl_flags; - - if ((fcntl_flags = fcntl (fd[1], F_GETFD, 0)) < 0 - || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1 - || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0 - || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1) - goto fail; - } - -# if O_BINARY - if (flags & O_BINARY) - { - setmode (fd[1], O_BINARY); - setmode (fd[0], O_BINARY); - } - else if (flags & O_TEXT) - { - setmode (fd[1], O_TEXT); - setmode (fd[0], O_TEXT); - } -# endif - - return 0; - -#endif - -#if GNULIB_defined_O_NONBLOCK || \ - !((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__) - fail: - { - int saved_errno = errno; - close (fd[0]); - close (fd[1]); - fd[0] = tmp[0]; - fd[1] = tmp[1]; - errno = saved_errno; - return -1; - } -#endif -} |