usr/src/lib/libc/gen/signal.c

/*
 * Copyright (c) 1985, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)signal.c    5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

/*
 * Almost backwards compatible signal.
 */
#include <signal.h>

sigset_t _sigintr;              /* shared with siginterrupt */

sig_t
signal(s, a)
        int s;
        sig_t a;
{
        struct sigaction sa, osa;

        sa.sa_handler = a;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
        if (!sigismember(&_sigintr, s))
                sa.sa_flags |= SA_RESTART;
        if (sigaction(s, &sa, &osa) < 0)
                return (SIG_ERR);
        return (osa.sa_handler);
}