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