[UNIX]signal函数捕捉SIGCLD信号

#include <apue.h>#include <sys/wait.h>static void sig_cld(int);int main(){pid_t pid;if(signal(SIGCLD,sig_cld) == SIG_ERR)perror("signal error");if((pid = fork()) < 0)perror("fork error");else if(pid == 0){   /* child */sleep(2);_exit(0);}pause();   /* parent */exit(0);}static void sig_cld(int signo){pid_t pid;int status;printf("SIGCLD received\n");if(signal(SIGCLD,sig_cld) == SIG_ERR)perror("signal error");if((pid = wait(&status)) < 0) /* fetch child status*/perror("wait error");printf("pid = %d\n",pid);}

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