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/* vi: set sw=4 ts=4: */
/*
* select() for uClibc
*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <sys/syscall.h>
#include <sys/select.h>
#include <stdint.h>
#ifdef __UCLIBC_HAS_THREADS_NATIVE__
#include <sysdep-cancel.h>
#else
#define SINGLE_THREAD_P 1
#endif
#define USEC_PER_SEC 1000000L
extern __typeof(select) __libc_select;
#if !defined(__NR__newselect) && !defined(__NR_select) && defined __USE_XOPEN2K
# define __NR___libc_pselect6 __NR_pselect6
_syscall6(int, __libc_pselect6, int, n, fd_set *, readfds, fd_set *, writefds,
fd_set *, exceptfds, const struct timespec *, timeout,
const sigset_t *, sigmask)
int __libc_select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
struct timespec _ts, *ts = 0;
if (timeout) {
uint32_t usec;
_ts.tv_sec = timeout->tv_sec;
/* GNU extension: allow for timespec values where the sub-sec
* field is equal to or more than 1 second. The kernel will
* reject this on us, so take care of the time shift ourself.
* Some applications (like readline and linphone) do this.
* See 'clarification on select() type calls and invalid timeouts'
* on the POSIX general list for more information.
*/
usec = timeout->tv_usec;
if (usec >= USEC_PER_SEC) {
_ts.tv_sec += usec / USEC_PER_SEC;
usec %= USEC_PER_SEC;
}
_ts.tv_nsec = usec * 1000;
ts = &_ts;
}
if (SINGLE_THREAD_P)
return __libc_pselect6(n, readfds, writefds, exceptfds, ts, 0);
#ifdef __UCLIBC_HAS_THREADS_NATIVE__
int oldtype = LIBC_CANCEL_ASYNC ();
int result = __libc_pselect6(n, readfds, writefds, exceptfds, ts, 0);
LIBC_CANCEL_RESET (oldtype);
return result;
#endif
}
#else
#ifdef __NR__newselect
# define __NR___syscall_select __NR__newselect
#else
# define __NR___syscall_select __NR_select
#endif
_syscall5(int, __syscall_select, int, n, fd_set *, readfds,
fd_set *, writefds, fd_set *, exceptfds, struct timeval *, timeout);
int __libc_select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
if (SINGLE_THREAD_P)
return __syscall_select(n, readfds, writefds, exceptfds, timeout);
#ifdef __UCLIBC_HAS_THREADS_NATIVE__
int oldtype = LIBC_CANCEL_ASYNC ();
int result = __syscall_select(n, readfds, writefds, exceptfds, timeout);
LIBC_CANCEL_RESET (oldtype);
return result;
#endif
}
#endif
weak_alias(__libc_select,select)
libc_hidden_weak(select)
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