1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
23*0Sstevel@tonic-gate
24*0Sstevel@tonic-gate /*
25*0Sstevel@tonic-gate * Copyright (c) 1987 Sun Microsystems, Inc.
26*0Sstevel@tonic-gate */
27*0Sstevel@tonic-gate
28*0Sstevel@tonic-gate #include <errno.h>
29*0Sstevel@tonic-gate #include <sys/signal.h>
30*0Sstevel@tonic-gate
31*0Sstevel@tonic-gate int
sighold(sig)32*0Sstevel@tonic-gate sighold(sig)
33*0Sstevel@tonic-gate int sig;
34*0Sstevel@tonic-gate {
35*0Sstevel@tonic-gate
36*0Sstevel@tonic-gate if (sig == SIGKILL) {
37*0Sstevel@tonic-gate errno = EINVAL;
38*0Sstevel@tonic-gate return (-1); /* sigblock quietly disallows SIGKILL */
39*0Sstevel@tonic-gate }
40*0Sstevel@tonic-gate (void) sigblock(sigmask(sig));
41*0Sstevel@tonic-gate return (0); /* SVID specifies 0 return on success */
42*0Sstevel@tonic-gate }
43*0Sstevel@tonic-gate
44*0Sstevel@tonic-gate int
sigrelse(sig)45*0Sstevel@tonic-gate sigrelse(sig)
46*0Sstevel@tonic-gate int sig;
47*0Sstevel@tonic-gate {
48*0Sstevel@tonic-gate
49*0Sstevel@tonic-gate if (sig == SIGKILL) {
50*0Sstevel@tonic-gate errno = EINVAL;
51*0Sstevel@tonic-gate return (-1); /* sigsetmask quietly disallows SIGKILL */
52*0Sstevel@tonic-gate }
53*0Sstevel@tonic-gate (void) sigsetmask(sigblock(0) & ~sigmask(sig));
54*0Sstevel@tonic-gate return (0); /* SVID specifies 0 return on success */
55*0Sstevel@tonic-gate }
56*0Sstevel@tonic-gate
57*0Sstevel@tonic-gate int
sigignore(sig)58*0Sstevel@tonic-gate sigignore(sig)
59*0Sstevel@tonic-gate int sig;
60*0Sstevel@tonic-gate {
61*0Sstevel@tonic-gate struct sigvec vec;
62*0Sstevel@tonic-gate
63*0Sstevel@tonic-gate if (sig == SIGKILL) {
64*0Sstevel@tonic-gate errno = EINVAL;
65*0Sstevel@tonic-gate return (-1); /* sigsetmask quietly disallows SIGKILL */
66*0Sstevel@tonic-gate }
67*0Sstevel@tonic-gate if (sigvec(sig, (struct sigvec *)0, &vec) < 0)
68*0Sstevel@tonic-gate return (-1);
69*0Sstevel@tonic-gate vec.sv_handler = SIG_IGN;
70*0Sstevel@tonic-gate if (sigvec(sig, &vec, (struct sigvec *)0) < 0)
71*0Sstevel@tonic-gate return (-1);
72*0Sstevel@tonic-gate (void) sigsetmask(sigblock(0) & ~sigmask(sig));
73*0Sstevel@tonic-gate return (0); /* SVID specifies 0 return on success */
74*0Sstevel@tonic-gate }
75*0Sstevel@tonic-gate
76*0Sstevel@tonic-gate void (*
77*0Sstevel@tonic-gate sigset(sig, func))()
78*0Sstevel@tonic-gate int sig;
79*0Sstevel@tonic-gate void (*func)();
80*0Sstevel@tonic-gate {
81*0Sstevel@tonic-gate struct sigvec newvec;
82*0Sstevel@tonic-gate int newmask;
83*0Sstevel@tonic-gate struct sigvec oldvec;
84*0Sstevel@tonic-gate int oldmask;
85*0Sstevel@tonic-gate
86*0Sstevel@tonic-gate if (sigvec(sig, (struct sigvec *)0, &oldvec) < 0)
87*0Sstevel@tonic-gate return (SIG_ERR);
88*0Sstevel@tonic-gate oldmask = sigblock(0);
89*0Sstevel@tonic-gate newvec = oldvec;
90*0Sstevel@tonic-gate newvec.sv_flags |= SV_INTERRUPT;
91*0Sstevel@tonic-gate newvec.sv_flags &= ~SV_RESETHAND;
92*0Sstevel@tonic-gate newvec.sv_mask = 0;
93*0Sstevel@tonic-gate newmask = oldmask;
94*0Sstevel@tonic-gate if (func == SIG_HOLD) {
95*0Sstevel@tonic-gate /*
96*0Sstevel@tonic-gate * Signal will be held. Set the bit for that
97*0Sstevel@tonic-gate * signal in the signal mask. Leave the action
98*0Sstevel@tonic-gate * alone.
99*0Sstevel@tonic-gate */
100*0Sstevel@tonic-gate newmask |= sigmask(sig);
101*0Sstevel@tonic-gate } else {
102*0Sstevel@tonic-gate /*
103*0Sstevel@tonic-gate * Signal will not be held. Clear the bit
104*0Sstevel@tonic-gate * for it in the signal mask. Set the action
105*0Sstevel@tonic-gate * for it.
106*0Sstevel@tonic-gate */
107*0Sstevel@tonic-gate newmask &= ~sigmask(sig);
108*0Sstevel@tonic-gate newvec.sv_handler = func;
109*0Sstevel@tonic-gate }
110*0Sstevel@tonic-gate if (sigvec(sig, &newvec, (struct sigvec *)0) < 0)
111*0Sstevel@tonic-gate return (SIG_ERR);
112*0Sstevel@tonic-gate if (sigsetmask(newmask) < 0)
113*0Sstevel@tonic-gate return (SIG_ERR);
114*0Sstevel@tonic-gate if (oldmask & sigmask(sig))
115*0Sstevel@tonic-gate return (SIG_HOLD); /* signal was held */
116*0Sstevel@tonic-gate else
117*0Sstevel@tonic-gate return (oldvec.sv_handler);
118*0Sstevel@tonic-gate }
119