1 // SPDX-License-Identifier: GPL-2.0-or-later
8  *        waitpid(pid, WNOHANG) should return 0 if there is a running child
10  *        waitpid(pid, WNOHANG) should return the pid of the child if
13  *        waitpid(-1, 0) should return -1 with ECHILD if
16  *        waitpid(-1, WNOHANG) should return -1 with ECHILD if
21 #include <sys/types.h>
22 #include <signal.h>
23 #include <errno.h>
24 #include <sys/wait.h>
25 #include <stdlib.h>
26 #include "tst_test.h"
28 static void cleanup_pid(pid_t pid)  in cleanup_pid()  argument
30 	if (pid > 0) {  in cleanup_pid()
31 		kill(pid, SIGKILL);  in cleanup_pid()
32 		waitpid(pid, NULL, 0);  in cleanup_pid()
38 	pid_t pid, ret;  in case0()  local
41 	pid = SAFE_FORK();  in case0()
42 	if (pid == 0) {  in case0()
49 		ret = waitpid(pid, &status, WNOHANG);  in case0()
51 		if ((ret == -1) && (errno == EINTR))  in case0()
59 		cleanup_pid(pid);  in case0()
64 	SAFE_WAITPID(pid, NULL, 0);  in case0()
66 	tst_res(TPASS, "waitpid(pid, WNOHANG) = 0 for a running child");  in case0()
71 	pid_t pid, ret;  in case1()  local
74 	pid = SAFE_FORK();  in case1()
75 	if (pid == 0)  in case1()
79 		ret = waitpid(pid, &status, WNOHANG);  in case1()
81 		if ((ret == -1) && (errno == EINTR))  in case1()
86 		if (ret == pid)  in case1()
90 			ret, pid);  in case1()
91 		cleanup_pid(pid);  in case1()
106 	tst_res(TPASS, "waitpid(pid, WNOHANG) = pid for an exited child");  in case1()
114 	ret = waitpid(-1, &status, 0);  in case2()
116 	if (ret != -1) {  in case2()
117 		tst_res(TFAIL, "Expected -1, got %d", ret);  in case2()
126 	tst_res(TPASS, "waitpid(-1, 0) = -1 with ECHILD if no children");  in case2()
134 	ret = waitpid(-1, &status, WNOHANG);  in case3()
135 	if (ret != -1) {  in case3()
136 		tst_res(TFAIL, "WNOHANG: Expected -1, got %d", ret);  in case3()
145 	tst_res(TPASS, "waitpid(-1, WNOHANG) = -1 with ECHILD if no children");  in case3()