p8-17.c

SUN Solaris8平台下进程间通信

#include <signal.h>
#include <errno.h>
void (*signal(int sig, void (*func)(int))) (int)
{
    struct sigaction act, oact;
    act.sa_handler = func;
    sigemptyset (&act.sa_mask);
    act.sa_flags = 0;
#ifdef SA_INTERRUPT         /* SunOS 4.x */
    act.sa_flags |= SA_INTERRUPT; 
#endif
    if (sigaction(sig,&act,&oact) < 0)
        return (SIG_ERR);
    return(oact.sa_handler);
}