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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
/* $FreeBSD$ */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <semaphore.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <err.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define SEM_NAME "/semtst"
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int test_unnamed(void);
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int test_named(void);
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int
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test_unnamed(void)
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{
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sem_t *s;
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pid_t pid;
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int status;
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printf("testing unnamed process-shared semaphore\n");
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s = (sem_t *)mmap(NULL, sizeof(sem_t), PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
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-1, 0);
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if (s == MAP_FAILED)
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err(1, "mmap failed");
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if (sem_init(s, 1, 0))
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err(2, "sem_init failed");
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if ((pid = fork()) == 0) {
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printf("child: sem_wait()\n");
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if (sem_wait(s))
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err(3, "sem_wait failed");
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printf("child: sem_wait() returned\n");
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exit(0);
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} else {
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sleep(1);
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printf("parent: sem_post()\n");
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if (sem_post(s))
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err(4, "sem_post failed");
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waitpid(pid, &status, 0);
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
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printf("OK.\n");
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else
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printf("Failure.");
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}
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return (0);
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}
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int
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test_named(void)
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{
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sem_t *s, *s2;
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pid_t pid;
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int status;
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printf("testing named process-shared semaphore\n");
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sem_unlink(SEM_NAME);
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s = sem_open(SEM_NAME, O_CREAT, 0777, 0);
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if (s == SEM_FAILED)
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err(1, "sem_open failed");
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s2 = sem_open(SEM_NAME, O_CREAT, 0777, 0);
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if (s2 == SEM_FAILED)
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err(2, "second sem_open call failed");
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if (s != s2)
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errx(3,
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"two sem_open calls for same semaphore do not return same address");
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if (sem_close(s2))
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err(4, "sem_close failed");
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if ((pid = fork()) == 0) {
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printf("child: sem_wait()\n");
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if (sem_wait(s))
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err(5, "sem_wait failed");
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printf("child: sem_wait() returned\n");
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exit(0);
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} else {
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sleep(1);
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printf("parent: sem_post()\n");
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if (sem_post(s))
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err(6, "sem_post failed");
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waitpid(pid, &status, 0);
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
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printf("OK.\n");
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else
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printf("Failure.");
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}
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if (sem_close(s))
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err(7, "sem_close failed");
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return (0);
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}
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int
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main(void)
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{
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test_unnamed();
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test_named();
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return (0);
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}
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