[linux]signal函數不起作用

標籤：

#include "apue.h"#include <sys/wait.h>static void sig_int(int); /* our signal-catching function */int main(int argc, char *argv[]){    printf("uid = %d, gid = %d\n", getuid(), getgid());        char buf[MAXLINE]; /* from apue.h */    pid_t pid;    int status;            // register the signal handler    if ( signal(SIGINT, sig_int) == SIG_ERR)        err_sys("signal error");        printf("%% "); /* print prompt (printf requires %% to print %) */    while (fgets(buf, MAXLINE, stdin) != NULL) {        if (buf[strlen(buf) - 1] == ‘\n‘)            buf[strlen(buf) - 1] = 0; /* replace newline with null */        if ((pid = fork()) < 0) {            err_sys("fork error");        } else if (pid == 0) { /* child */            execlp(buf, buf, (char *)0);            err_ret("couldn‘t execute: %s", buf);            exit(127);        }        /* parent */        if ((pid = waitpid(pid, &status, 0)) < 0)            err_sys("waitpid error");        printf("Last pid: %ld\n", (long)pid);        printf("%% ");    }        exit(0);}void sig_int(int signo){    printf("sig_int: interrupt\n%% ");    exit(0); // I add this line to exit the program through CTRL+C (SIGINT), CTRL+D is to terminate the program}

代碼來自APUE Figure1.10

我編譯之後用gdb調試，發現sig_int始終不會被調用

最後終於發現問題是因為編譯選項加了-g，在調試狀態下signal機制貌似被禁用了

[linux]signal函數不起作用