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author | Jakub Jelinek <jakub@redhat.com> | 2007-07-12 18:26:36 +0000 |
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committer | Jakub Jelinek <jakub@redhat.com> | 2007-07-12 18:26:36 +0000 |
commit | 0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch) | |
tree | 2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /sysdeps/unix/sysv/linux/pselect.c | |
parent | 7d58530341304d403a6626d7f7a1913165fe2f32 (diff) | |
download | glibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.zip glibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.gz glibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.bz2 |
2.5-18.1
Diffstat (limited to 'sysdeps/unix/sysv/linux/pselect.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/pselect.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/pselect.c b/sysdeps/unix/sysv/linux/pselect.c new file mode 100644 index 0000000..0dd744f --- /dev/null +++ b/sysdeps/unix/sysv/linux/pselect.c @@ -0,0 +1,100 @@ +/* Copyright (C) 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2006. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <signal.h> +#include <time.h> +#include <sys/poll.h> +#include <kernel-features.h> +#include <sysdep-cancel.h> + + +#ifdef __NR_pselect6 +static int __generic_pselect (int nfds, fd_set *readfds, fd_set *writefds, + fd_set *exceptfds, + const struct timespec *timeout, + const sigset_t *sigmask); + + +int +__pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, + const struct timespec *timeout, const sigset_t *sigmask) +{ + /* The Linux kernel can in some situations update the timeout value. + We do not want that so use a local variable. */ + struct timespec tval; + if (timeout != NULL) + { + tval = *timeout; + timeout = &tval; + } + + /* Note: the system call expects 7 values but on most architectures + we can only pass in 6 directly. If there is an architecture with + support for more parameters a new version of this file needs to + be created. */ + struct + { + const sigset_t *ss; + size_t ss_len; + } data; + + data.ss = sigmask; + data.ss_len = _NSIG / 8; + + int result; + +#ifndef CALL_PSELECT6 +# define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \ + INLINE_SYSCALL (pselect6, 6, nfds, readfds, writefds, exceptfds, \ + timeout, data) +#endif + + if (SINGLE_THREAD_P) + result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout, + &data); + else + { + int oldtype = LIBC_CANCEL_ASYNC (); + + result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout, + &data); + + LIBC_CANCEL_RESET (oldtype); + } + +# ifndef __ASSUME_PSELECT + if (result == -1 && errno == ENOSYS) + result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout, + sigmask); +# endif + + return result; +} +weak_alias (__pselect, pselect) +strong_alias (__pselect, __libc_pselect) + +# ifndef __ASSUME_PSELECT +# define __pselect static __generic_pselect +# endif +#endif + +#ifndef __ASSUME_PSELECT +# include <misc/pselect.c> +#endif |