91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/*
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Copyright (c) 2009 Niels Martin Hansen
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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 are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of the Aegisub Group nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/time.h>
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/*
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Return codes:
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1: Error in kqueue()
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2: Error in kevent()
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3: Timed out waiting for parent to exit
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4: Error in execve()
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If none of those happen the requested command is execve()'d.
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*/
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int main(int argc, char *argv[], char *env[])
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{
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int waitpid = getppid();
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int queue, nchange;
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struct kevent event[1];
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struct kevent change[1];
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struct timespec timeout = { 30, 0 };
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if ((queue = kqueue()) == -1)
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{
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perror("kqueue()");
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return 1;
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}
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EV_SET(event,
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waitpid,
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EVFILT_PROC,
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EV_ADD|EV_ENABLE|EV_ONESHOT,
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NOTE_EXIT,
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0, 0);
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nchange = kevent(queue, change, 1, event, 1, &timeout);
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if (nchange < 0)
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{
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perror("kevent()");
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return 2;
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}
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else if (nchange == 0)
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{
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return 3;
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}
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else if (change[0].flags & EV_ERROR)
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{
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return 2;
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}
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else
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{
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close(queue);
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if (execve(argv[1], argv+1, env) == -1)
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{
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perror("execve()");
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return 4;
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}
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return 0; /* never reached */
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}
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}
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