| | 1 | /* |
| | 2 | * Copyright 2000 Massachusetts Institute of Technology |
| | 3 | * |
| | 4 | * Permission to use, copy, modify, and distribute this software and |
| | 5 | * its documentation for any purpose and without fee is hereby |
| | 6 | * granted, provided that both the above copyright notice and this |
| | 7 | * permission notice appear in all copies, that both the above |
| | 8 | * copyright notice and this permission notice appear in all |
| | 9 | * supporting documentation, and that the name of M.I.T. not be used |
| | 10 | * in advertising or publicity pertaining to distribution of the |
| | 11 | * software without specific, written prior permission. M.I.T. makes |
| | 12 | * no representations about the suitability of this software for any |
| | 13 | * purpose. It is provided "as is" without express or implied |
| | 14 | * warranty. |
| | 15 | * |
| | 16 | * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS |
| | 17 | * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| | 18 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| | 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT |
| | 20 | * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| | 21 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| | 22 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| | 23 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| | 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| | 25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| | 26 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 27 | * SUCH DAMAGE. |
| | 28 | */ |
| | 29 | |
| | 30 | #include <sys/cdefs.h> |
| | 31 | __FBSDID("$FreeBSD: src/lib/libc/gen/pselect.c,v 1.6 2002/10/12 16:13:37 mike Exp $"); |
| | 32 | |
| | 33 | #include "namespace.h" |
| | 34 | #include <sys/select.h> |
| | 35 | #include <sys/time.h> |
| | 36 | |
| | 37 | #include <errno.h> |
| | 38 | #include <signal.h> |
| | 39 | #include "un-namespace.h" |
| | 40 | |
| | 41 | __weak_reference(__pselect, pselect); |
| | 42 | |
| | 43 | /* |
| | 44 | * Emulate the POSIX 1003.1g-2000 `pselect' interface. This is the |
| | 45 | * same as the traditional BSD `select' function, except that it uses |
| | 46 | * a timespec rather than a timeval, doesn't modify the timeout argument, |
| | 47 | * and allows the user to specify a signal mask to apply during the select. |
| | 48 | */ |
| | 49 | int |
| | 50 | __pselect(int count, fd_set * __restrict rfds, fd_set * __restrict wfds, |
| | 51 | fd_set * __restrict efds, const struct timespec * __restrict timo, |
| | 52 | const sigset_t * __restrict mask) |
| | 53 | { |
| | 54 | sigset_t omask; |
| | 55 | struct timeval tvtimo, *tvp; |
| | 56 | int rv, sverrno; |
| | 57 | |
| | 58 | if (timo) { |
| | 59 | TIMESPEC_TO_TIMEVAL(&tvtimo, timo); |
| | 60 | tvp = &tvtimo; |
| | 61 | } else |
| | 62 | tvp = 0; |
| | 63 | |
| | 64 | if (mask != 0) { |
| | 65 | rv = _sigprocmask(SIG_SETMASK, mask, &omask); |
| | 66 | if (rv != 0) |
| | 67 | return rv; |
| | 68 | } |
| | 69 | |
| | 70 | rv = _select(count, rfds, wfds, efds, tvp); |
| | 71 | if (mask != 0) { |
| | 72 | sverrno = errno; |
| | 73 | _sigprocmask(SIG_SETMASK, &omask, (sigset_t *)0); |
| | 74 | errno = sverrno; |
| | 75 | } |
| | 76 | |
| | 77 | return rv; |
| | 78 | } |
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