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#define _GNU_SOURCE
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sched.h>
int main(int argc, char **argv)
{
if (argc < 2) {
fprintf(stderr, "Usage: newns PROGRAM [ARGUMENTS ...]\n");
exit(1);
}
/* This is best-effort; if the kernel is too old (Linux << 2.6.16),
* or indeed if the kernel isn't Linux so we don't have
* unshare(CLONE_NEWNS), don't worry about it.
*/
#ifdef __linux__
if (unshare(CLONE_NEWNS) < 0 && errno != ENOSYS)
perror("unshare failed");
/* ... but continue anyway */
#endif /* __linux__ */
setenv("OS_PROBER_NEWNS", "1", 1);
execvp(argv[1], argv + 1);
perror("execvp failed");
_exit(127);
}
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