测试用例℃,WIFSIGNALED,WIFSTOPPED,WIFCONTINUED [英] Test cases in C for WIFSIGNALED, WIFSTOPPED, WIFCONTINUED
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问题描述
我和waitpid函数()和信号(打)和我在寻找可靠的测试案例返回WIFSIGNALED(状态)= WIFSTOPPED(状态)= WIFCONTINUED(状态)= true,但找不到任何..
介意告诉我怎样才能确保那些返回true,所以我可以调试我的code?
此外,什么信号应我的信号()来测试这些宏赶上将是有益的一些提示...
解决方案
的#include<&errno.h中GT;
#包括LT&;&signal.h中GT;
#包括LT&;&stdio.h中GT;
#包括LT&;&stdlib.h中GT;
#包括LT&; SYS / wait.h>
#包括LT&;&unistd.h中GT;#定义NELEMS(X)(sizeof的(X)/的sizeof(X)[0])静态无效testsignaled(无效){
杀号(getpid(),SIGINT);
}静态无效teststopped(无效){
杀号(getpid(),SIGSTOP);
}静态无效testcontinued(无效){
杀号(getpid(),SIGSTOP);
/ *忙工作,以使我们从父之前等待退出。
*这是一场比赛。
* /
报警(1);
而(1){}
}诠释主要(无效){
无效(*测试[])(无效)= {testsignaled,teststopped,testcontinued};
将为pid_t PID [NELEMS(试验)];
INT I,地位;
对于(I = 0; I&下; sizeof的测试/ sizeof的测试[0] ++ⅰ){
PID [I] =叉();
如果(0 == PID由[i]){
测试[I]();
返回0;
}
}
/ *暂停让子进程做他们的事。
*这是一场比赛。
* /
睡眠(1);
/ *遵守第三个过程的停止,继续吧。 * /
wait4(PID [2],&放大器;状态,WUNTRACED,0);
杀死(PID [2],SIGCONT);
/ *等待子进程。 * /
对于(I = 0; I&下; NELEMS(测试)++ⅰ){
wait4(PID由[i],&放大器;状态,WCONTINUED | WUNTRACED,0);
?的printf(%D%s%S%S \\ n,我,WIFCONTINUED(状态)续:,WIFSIGNALED(状态)?暗示:,WIFSTOPPED(状态)已停止? );
}
返回0;
}
I'm playing with waitpid() and signal() and I'm looking for reliable test cases for returning WIFSIGNALED(status) = WIFSTOPPED(status) = WIFCONTINUED (status) = true but can't find any...
Care to tell me how can I make sure those return true so I can debug my code?
Also, a few hints about what signals should I catch with signal() to test those macros would be helpful...
解决方案
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>
#define NELEMS(x) (sizeof (x) / sizeof (x)[0])
static void testsignaled(void) {
kill(getpid(), SIGINT);
}
static void teststopped(void) {
kill(getpid(), SIGSTOP);
}
static void testcontinued(void) {
kill(getpid(), SIGSTOP);
/* Busy-work to keep us from exiting before the parent waits.
* This is a race.
*/
alarm(1);
while(1) {}
}
int main(void) {
void (*test[])(void) = {testsignaled, teststopped, testcontinued};
pid_t pid[NELEMS(test)];
int i, status;
for(i = 0; i < sizeof test / sizeof test[0]; ++i) {
pid[i] = fork();
if(0 == pid[i]) {
test[i]();
return 0;
}
}
/* Pause to let the child processes to do their thing.
* This is a race.
*/
sleep(1);
/* Observe the stoppage of the third process and continue it. */
wait4(pid[2], &status, WUNTRACED, 0);
kill(pid[2], SIGCONT);
/* Wait for the child processes. */
for(i = 0; i < NELEMS(test); ++i) {
wait4(pid[i], &status, WCONTINUED | WUNTRACED, 0);
printf("%d%s%s%s\n", i, WIFCONTINUED(status) ? " CONTINUED" : "", WIFSIGNALED(status) ? " SIGNALED" : "", WIFSTOPPED(status) ? " STOPPED" : "");
}
return 0;
}
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