Dmitry V. Levin
39e3be6d74
* tests/select.c (main): Check how timeout is printed on exiting syscall.
126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/*
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* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Based on test by Dr. David Alan Gilbert <dave@treblig.org>
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/select.h>
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#include <sys/syscall.h>
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#undef NR_select
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#if defined __NR__newselect
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# define NR_select __NR__newselect
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#elif defined __NR_select
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# define NR_select __NR_select
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#endif
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#ifdef NR_select
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static fd_set set[0x1000000 / sizeof(fd_set)];
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int main(void)
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{
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int fds[2];
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struct {
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struct timeval tv;
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int pad[2];
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} tm_in = {
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.tv = { .tv_sec = 0xc0de1, .tv_usec = 0xc0de2 },
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.pad = { 0xdeadbeef, 0xbadc0ded }
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}, tm = tm_in;
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if (pipe(fds))
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return 77;
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/*
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* Start with a nice simple select.
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*/
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FD_ZERO(set);
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FD_SET(fds[0], set);
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FD_SET(fds[1], set);
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if (syscall(NR_select, fds[1] + 1, set, set, set, NULL) != 1)
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return 77;
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printf("select(%d, [%d %d], [%d %d], [%d %d], NULL) = 1 ()\n",
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fds[1] + 1, fds[0], fds[1],
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fds[0], fds[1], fds[0], fds[1]);
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/*
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* Another simple one, with a timeout.
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*/
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FD_SET(1, set);
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FD_SET(2, set);
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FD_SET(fds[0], set);
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FD_SET(fds[1], set);
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if (syscall(NR_select, fds[1] + 1, NULL, set, NULL, &tm.tv) != 3)
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return 77;
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printf("select(%d, NULL, [1 2 %d %d], NULL, {%Ld, %Ld})"
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" = 3 (out [1 2 %d], left {%Ld, %Ld})\n",
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fds[1] + 1, fds[0], fds[1],
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(long long) tm_in.tv.tv_sec, (long long) tm_in.tv.tv_usec,
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fds[1],
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(long long) tm.tv.tv_sec, (long long) tm.tv.tv_usec);
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/*
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* Now the crash case that trinity found, negative nfds
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* but with a pointer to a large chunk of valid memory.
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*/
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FD_ZERO(set);
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FD_SET(fds[1],set);
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if (syscall(NR_select, -1, NULL, set, NULL, NULL) != -1)
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return 77;
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printf("select(-1, NULL, %p, NULL, NULL) "
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"= -1 EINVAL (Invalid argument)\n", set);
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/*
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* Another variant, with nfds exceeding FD_SETSIZE limit.
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*/
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FD_ZERO(set);
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FD_SET(fds[0],set);
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tm.tv.tv_sec = 0;
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tm.tv.tv_usec = 123;
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if (syscall(NR_select, FD_SETSIZE + 1, set, set + 1, NULL, &tm.tv))
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return 77;
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printf("select(%d, [%d], [], NULL, {0, 123}) = 0 (Timeout)\n",
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FD_SETSIZE + 1, fds[0]);
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puts("+++ exited with 0 +++");
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return 0;
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}
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#else
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int
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main(void)
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{
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return 77;
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}
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#endif
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