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      1 /*
      2  * Copyright (c) 2003, Intel Corporation. All rights reserved.
      3  * Created by:  salwan.searty REMOVE-THIS AT intel DOT com
      4  * This file is licensed under the GPL license.  For the full content
      5  * of this license, see the COPYING file at the top level of this
      6  * source tree.
      7 
      8  Assumption: The test assumes that this program is run under normal conditions,
      9  and not when the processor and other resources are too stressed.
     10 
     11  Steps:
     12  1. Fork() a child process. Have the child suspend itself.
     13  2. From the parent, send the child a SIGUSR1 signal so that the child returns from
     14     suspension.
     15  3. In the child process, make sure that sigsuspend returns a -1 and pass that info
     16     to the parent process.
     17 
     18 */
     19 
     20 #include <signal.h>
     21 #include <sys/types.h>
     22 #include <sys/wait.h>
     23 #include <stdio.h>
     24 #include <stdlib.h>
     25 #include <unistd.h>
     26 #include "posixtest.h"
     27 
     28 void handler(int signo)
     29 {
     30 	printf("Now inside signal handler\n");
     31 }
     32 
     33 int main(void)
     34 {
     35 	pid_t pid;
     36 	pid = fork();
     37 
     38 	if (pid == 0) {
     39 		/* child */
     40 
     41 		sigset_t tempmask;
     42 
     43 		struct sigaction act;
     44 
     45 		act.sa_handler = handler;
     46 		act.sa_flags = 0;
     47 		sigemptyset(&act.sa_mask);
     48 
     49 		sigemptyset(&tempmask);
     50 
     51 		if (sigaction(SIGUSR1, &act, 0) == -1) {
     52 			perror
     53 			    ("Unexpected error while attempting to pre-conditions");
     54 			return 3;
     55 		}
     56 
     57 		printf("suspending child\n");
     58 		if (sigsuspend(&tempmask) != -1) {
     59 			perror("sigsuspend error");
     60 			return 1;
     61 		}
     62 		printf("returned from suspend\n");
     63 
     64 		sleep(1);
     65 		return 2;
     66 
     67 	} else {
     68 		int s;
     69 		int exit_status;
     70 
     71 		/* parent */
     72 		sleep(1);
     73 
     74 		printf("parent sending child a SIGUSR1 signal\n");
     75 		kill(pid, SIGUSR1);
     76 
     77 		if (wait(&s) == -1) {
     78 			perror("Unexpected error while setting up test "
     79 			       "pre-conditions");
     80 			return PTS_UNRESOLVED;
     81 		}
     82 
     83 		exit_status = WEXITSTATUS(s);
     84 
     85 		printf("Exit status from child is %d\n", exit_status);
     86 
     87 		if (exit_status == 1) {
     88 			printf("Test FAILED\n");
     89 			return PTS_FAIL;
     90 		}
     91 
     92 		if (exit_status == 2) {
     93 			printf("Test PASSED\n");
     94 			return PTS_PASS;
     95 		}
     96 
     97 		if (exit_status == 3) {
     98 			return PTS_UNRESOLVED;
     99 		}
    100 
    101 		printf
    102 		    ("Child didn't exit with any of the expected return codes\n");
    103 		return PTS_UNRESOLVED;
    104 	}
    105 }
    106