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#include <sched.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <fcntl.h>
#include "zdtmtst.h"
#include "lock.h"
const char *test_doc = "Check C/R of pidfds that point to threads\n";
const char *test_author = "Bhavik Sachdev <b.sachdev1904@gmail.com>";
/* see also: https://codebrowser.dev/glibc/glibc/sysdeps/unix/sysv/linux/tst-clone3.c.html */
#ifndef PIDFD_THREAD
#define PIDFD_THREAD O_EXCL
#endif
#ifndef PIDFD_SIGNAL_THREAD
#define PIDFD_SIGNAL_THREAD (1UL << 0)
#endif
#ifndef PID_FS_MAGIC
#define PID_FS_MAGIC 0x50494446
#endif
static long get_fs_type(int lfd)
{
struct statfs fst;
if (fstatfs(lfd, &fst)) {
return -1;
}
return fst.f_type;
}
static int pidfd_open(pid_t pid, unsigned int flags)
{
return syscall(__NR_pidfd_open, pid, flags);
}
static int pidfd_send_signal(int pidfd, int sig, siginfo_t* info, unsigned int flags)
{
return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
}
static int thread_func(void *a)
{
test_waitsig();
return 0;
}
#define CTID_INIT_VAL 1
int main(int argc, char* argv[])
{
char st[64 * 1024] __attribute__ ((aligned));
pid_t tid;
int pidfd, test_pidfd;
futex_t exited;
int clone_flags = CLONE_THREAD;
clone_flags |= CLONE_VM | CLONE_SIGHAND;
clone_flags |= CLONE_CHILD_CLEARTID;
test_init(argc, argv);
test_pidfd = pidfd_open(getpid(), 0);
if (test_pidfd < 0) {
pr_perror("pidfd_open() failed");
return 1;
}
/* PIDFD_THREAD, PIDFD_SIGNAL_THREAD are supported only with pidfs */
if (get_fs_type(test_pidfd) != PID_FS_MAGIC) {
test_daemon();
test_waitsig();
skip("pidfs not supported.");
close(test_pidfd);
return 0;
}
close(test_pidfd);
futex_set(&exited, CTID_INIT_VAL);
tid = clone(thread_func, st + sizeof(st), clone_flags, NULL, NULL, NULL, &(exited.raw));
if (tid == -1) {
pr_perror("clone() failed");
return 1;
}
test_msg("Successfully created a thread with tid: %d\n", tid);
pidfd = pidfd_open(tid, PIDFD_THREAD);
if (pidfd < 0) {
pr_perror("pidfd_open() failed");
return 1;
}
test_daemon();
test_waitsig();
if (pidfd_send_signal(pidfd, SIGTERM, NULL, PIDFD_SIGNAL_THREAD)) {
pr_perror("pidfd_send_signal() failed");
fail();
close(pidfd);
return 1;
}
test_msg("Waiting for thread to exit\n");
futex_wait_until(&exited, 0);
pass();
close(pidfd);
return 0;
}
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