Attachment 156182 Details for Bug 242635 – Test case

Test case

ptrace-bug.c (text/plain), 1.97 KB, created by Magnus Vesterlund on 2007-06-05 07:50:22 UTC

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Filename:

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Creator: Magnus Vesterlund

Created: 2007-06-05 07:50:22 UTC

Size: 1.97 KB

patch

obsolete

>#include <stdlib.h>
>#include <stdio.h>
>#include <unistd.h>
>#include <sys/wait.h>
>#include <sys/ptrace.h>
>#include <linux/ptrace.h>
>#include <pthread.h>
>#include <assert.h>
>
>#define PTRACE_EVENT(status) ((status) >> 16)
>
>static void *
>thread_entry(void *arg)
>{
>    /* Child thread, just exit. */
>    return NULL;
>}
>
>int
>main(int argc, char **argv)
>{
>    int pid = fork();
>    assert(pid != -1);
>
>    if (pid == 0) {
>        /* Child processes, wait a second for the parent to attach. */
>        sleep(1);
>
>        /* Create the child thread. */
>        int res;
>        pthread_t thread;
>        pthread_attr_t attr;
>        res = pthread_attr_init(&attr);
>        assert(res == 0);
>        res = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
>        assert(res == 0);
>        res = pthread_create(&thread, &attr, thread_entry, NULL);
>        assert(res == 0);
>        res = pthread_attr_destroy(&attr);
>        assert(res == 0);
>
>        /* Exit. */
>        pthread_exit(NULL);
>    }
>    else {
>        long res;
>        int status;
>
>        /* Attach to the child process. */
>        res = ptrace(PTRACE_ATTACH, pid, NULL, NULL);
>        assert(res != -1);
>
>        /* Trace the child process until both threads have exited. */
>        int exits = 0;
>        do {
>            pid_t tid = waitpid(-1, &status, __WALL);
>            assert(tid != -1);
>
>            if (WIFSTOPPED(status)) {
>                printf("tid %d: signal %d, ptrace event %d\n", tid, WSTOPSIG(status), PTRACE_EVENT(status));
>
>                res = ptrace(PTRACE_SETOPTIONS, tid, NULL, (void *)(PTRACE_O_TRACECLONE | PTRACE_O_TRACEEXIT));
>                assert(res != -1);
>
>                res = ptrace(PTRACE_CONT, tid, NULL, (void *)0L);
>                assert(res != -1);
>            } else if (WIFEXITED(status)) {
>                printf("tid %d: exit status %d\n", tid, WEXITSTATUS(status));
>                exits++;
>            }
>            else
>                assert(0);
>        } while (exits < 2);
>    }
>
>    return 0;
>}

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Attachments on bug 242635: 156182