From d3ad15ac54e0e8f66dec2957e57e6359932e44d7 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Sun, 12 Feb 2006 09:47:49 +0000 Subject: grab pselect from glibc --- libc/sysdeps/linux/common/pselect.c | 66 +++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 libc/sysdeps/linux/common/pselect.c (limited to 'libc/sysdeps') diff --git a/libc/sysdeps/linux/common/pselect.c b/libc/sysdeps/linux/common/pselect.c new file mode 100644 index 000000000..93a85a622 --- /dev/null +++ b/libc/sysdeps/linux/common/pselect.c @@ -0,0 +1,66 @@ +/* Copyright (C) 1996-1998,2001,2002,2003,2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1996. + + 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 +#include +#include /* For NULL. */ +#include +#include + +libc_hidden_proto(sigprocmask) +libc_hidden_proto(select) + + +/* 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. Additionally set the sigmask + SIGMASK for this call. Returns the number of ready descriptors, or -1 for + errors. */ +int +pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, + const struct timespec *timeout, const sigset_t *sigmask) +{ + struct timeval tval; + int retval; + sigset_t savemask; + + /* Change nanosecond number to microseconds. This might mean losing + precision and therefore the `pselect` should be available. But + for now it is hardly found. */ + if (timeout != NULL) + TIMESPEC_TO_TIMEVAL (&tval, timeout); + + /* The setting and restoring of the signal mask and the select call + should be an atomic operation. This can't be done without kernel + help. */ + if (sigmask != NULL) + sigprocmask (SIG_SETMASK, sigmask, &savemask); + + /* Note the pselect() is a cancellation point. But since we call + select() which itself is a cancellation point we do not have + to do anything here. */ + retval = select (nfds, readfds, writefds, exceptfds, + timeout != NULL ? &tval : NULL); + + if (sigmask != NULL) + sigprocmask (SIG_SETMASK, &savemask, NULL); + + return retval; +} -- cgit v1.2.3