mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
26f28fd73d
This patch consolidates the select Linux syscall implementation on
sysdeps/unix/sysv/linux/select.c. The changes are:
1. Remove select from auto-generation syscalls.list on the architecture
that uses __NR_select.
2. Remove generic implementation add a default one that handle all
current cases (with the expection of alpha)
The new default implementation will either use __NR_select if
available of fallback to __NR_pselect6 otherwise.
3. Add a alpha outlier implementation which requires old compatibility
symbols.
Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu.
* sysdeps/unix/sysv/linux/alpha/Makefile (sysdep_routines): Add
osf_select.
* sysdeps/unix/sysv/linux/alpha/select.c: New file.
* sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove select and
osf_select from auto-generation list.
* sysdeps/unix/sysv/linux/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/generic/select.c: Remove file.
* sysdeps/unix/sysv/linux/select.c: New file.
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* Linux select implementation.
|
|
Copyright (C) 2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <sys/select.h>
|
|
#include <errno.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
|
|
readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
|
|
(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
|
|
after waiting the interval specified therein. Returns the number of ready
|
|
descriptors, or -1 for errors. */
|
|
|
|
#ifdef __NR__newselect
|
|
# undef __NR_select
|
|
# define __NR_select __NR__newselect
|
|
#endif
|
|
|
|
int
|
|
__select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
|
|
struct timeval *timeout)
|
|
{
|
|
#ifdef __NR_select
|
|
return SYSCALL_CANCEL (select, nfds, readfds, writefds, exceptfds,
|
|
timeout);
|
|
#else
|
|
int result;
|
|
struct timespec ts, *tsp = NULL;
|
|
|
|
if (timeout)
|
|
{
|
|
TIMEVAL_TO_TIMESPEC (timeout, &ts);
|
|
tsp = &ts;
|
|
}
|
|
|
|
result = SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, tsp,
|
|
NULL);
|
|
|
|
if (timeout)
|
|
{
|
|
/* Linux by default will update the timeout after a pselect6 syscall
|
|
(though the pselect() glibc call suppresses this behavior).
|
|
Since select() on Linux has the same behavior as the pselect6
|
|
syscall, we update the timeout here. */
|
|
TIMESPEC_TO_TIMEVAL (timeout, &ts);
|
|
}
|
|
|
|
return result;
|
|
#endif
|
|
}
|
|
libc_hidden_def (__select)
|
|
|
|
weak_alias (__select, select)
|
|
weak_alias (__select, __libc_select)
|