p8-4.c

SUN Solaris8平台下进程间通信

#include <signal.h>
void termination_handler(int signum)
{
     struct temp_file *p;
     for (p = temp_file_list; p; p = p->next)
         unlink (p->name);
}
int main (void)
{
    ...
    struct sigaction new_action, old_action;
    /* 设置sigaction结构指明信号动作. */
    new_action.sa_handler = termination_handler;
    sigemptyset(&new_action.sa_mask);
    new_action.sa_flags = 0;
    /* 分别查询各个信号的当前设置，仅当它们不是SIG_IGN时才设置新的句柄 */
    sigaction(SIGINT, NULL, &old_action);
    if (old_action.sa_handler != SIG_IGN)
        sigaction (SIGINT, &new_action, NULL);
    sigaction(SIGHUP, NULL, &old_action);
    if (old_action.sa_handler != SIG_IGN)
        sigaction (SIGHUP, &new_action, NULL);
    sigaction(SIGTERM, NULL, &old_action);
    if (old_action.sa_handler != SIG_IGN)
        sigaction (SIGTERM, &new_action, NULL);
    ...
}