sigchld.c

unix环境高级编程的源代码

#include    "calld.h"
#include    <sys/wait.h>

/* SIGCHLD handler, invoked when a child terminates. */

void
sig_chld(int signo)
{
    int        stat, errno_save;
    pid_t    pid;

    errno_save = errno;        /* log_msg() might change errno */
    chld_flag = 1;
    if ( (pid = waitpid(-1, &stat, 0)) <= 0)
        log_sys("waitpid error");

    if (WIFEXITED(stat) != 0)
                    /* set client's childdone status for loop() */
        client_sigchld(pid, WEXITSTATUS(stat)+1);
    else
        log_msg("child %d terminated abnormally: %04x", pid, stat);

    errno = errno_save;
    return;        /* probably interrupts accept() in serv_accept() */
}