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      1 // SPDX-License-Identifier: GPL-2.0-or-later
      2 /*
      3  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
      4  * Author: Richard Logan
      5  *
      6  * Test Description:
      7  *  The process does a fork:
      8  *	1) By the value returned by child's alarm(0), check whether child
      9  *	   process cleared the previously specified alarm request or not.
     10  *	2) By the value returned by parent's alarm(0), check whether parent
     11  *	   process cleared the previously specified alarm request or not.
     12  */
     13 
     14 #include <errno.h>
     15 #include <signal.h>
     16 #include <stdlib.h>
     17 #include <unistd.h>
     18 
     19 #include "tst_test.h"
     20 
     21 static void verify_alarm(void)
     22 {
     23 	pid_t pid;
     24 
     25 	TEST(alarm(100));
     26 
     27 	pid = SAFE_FORK();
     28 	if (pid == 0) {
     29 		TEST(alarm(0));
     30 		if (TST_RET != 0) {
     31 			tst_res(TFAIL,
     32 				"alarm(100), fork, alarm(0) child's "
     33 				"alarm returned %ld", TST_RET);
     34 		} else {
     35 			tst_res(TPASS,
     36 				"alarm(100), fork, alarm(0) child's "
     37 				"alarm returned %ld", TST_RET);
     38 		}
     39 		exit(0);
     40 	}
     41 
     42 	TEST(alarm(0));
     43 	if (TST_RET != 100) {
     44 		tst_res(TFAIL,
     45 			"alarm(100), fork, alarm(0) parent's "
     46 			"alarm returned %ld", TST_RET);
     47 	} else {
     48 		tst_res(TPASS,
     49 			"alarm(100), fork, alarm(0) parent's "
     50 			"alarm returned %ld", TST_RET);
     51 	}
     52 }
     53 
     54 static struct tst_test test = {
     55 	.test_all = verify_alarm,
     56 	.forks_child = 1,
     57 };
     58