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60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
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* Clone test.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sched.h>
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#include <errno.h>
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#include <tests.h>
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int clone_global = 0;
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extern pid_t parent_of_all;
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int my_thread_func(void *arg)
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{
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for (int i = 0; i < 25; i++)
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clone_global++;
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_exit(0);
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}
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int clonetest(void)
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{
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pid_t childid;
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void *child_stack;
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/* Parent loops and calls clone() to clone new threads. Children don't come back from the clone() call */
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for (int i = 0; i < 4; i++) {
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if ((child_stack = mmap(0, 0x1000, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_GROWSDOWN, 0, 0)) == MAP_FAILED) {
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test_printf("MMAP failed.\n");
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goto out_err;
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} else {
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test_printf("Mapped area starting at %p\n", child_stack);
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}
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((int *)child_stack)[-1] = 5; /* Test mapped area */
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test_printf("Cloning...\n");
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if ((childid = clone(my_thread_func, child_stack,
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CLONE_PARENT | CLONE_FS | CLONE_VM | CLONE_THREAD | CLONE_SIGHAND, 0)) < 0) {
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test_printf("CLONE failed.\n");
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goto out_err;
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} else {
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test_printf("Cloned a new thread with child pid %d\n", childid);
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}
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}
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/* TODO: Add wait() or something similar and check that global is 100 */
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if (getpid() == parent_of_all)
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printf("CLONE TEST -- PASSED --\n");
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return 0;
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out_err:
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printf("CLONE TEST -- FAILED --\n");
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return 0;
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}
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