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/*
* Starts any programs with PR_SET_CHILD_SUBREAPER on Linux.
* Author: Yuuta Liang
*/
#define _POSIX_C_SOURCE 200809L
#define _GNU_SOURCE
#include <sys/prctl.h>
#include <err.h>
#include <errno.h>
#include <assert.h>
#include <stddef.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#ifndef TEST
int main(int argc, char **argv) {
int r;
assert(argc);
if (argc == 1)
errx(64, "Usage: %s /path/to/binary [arg1] [arg2] ...",
argv[0]);
/* path is not freed on intend. */
char *path = realpath(argv[1], NULL);
if (!path)
err(errno, "realpath(%s)", argv[1]);
if ((r = prctl(PR_SET_CHILD_SUBREAPER, 1) < 0))
err(errno, "prctl(PR_SET_CHILD_SUBREAPER)");
if ((r = execve(path, &argv[1], environ)))
err(errno, "exec(%s)", path);
}
#else /* ifndef TEST */
#include <stdio.h>
int main(void) {
printf("Parent PID: %d\n", getpid());
if (!fork()) {
printf("Fork PID: %d\n", getpid());
unsigned int counter = 0;
goto f;
f:
counter ++;
if (!fork()) {
printf("Child PID: %d\n", getpid());
pause();
}
if (counter < 20) goto f;
exit(0);
}
pause();
}
#endif /* ifndef TEST */
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