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Consolidate Linux select implementation

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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.
This commit is contained in:
Adhemerval Zanella
2016-11-18 14:27:03 -02:00
parent b5eede9730
commit 26f28fd73d
7 changed files with 78 additions and 11 deletions
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71
sysdeps/unix/sysv/linux/select.c Normal file
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/* 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)