Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 PathScale, Inc |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 7 | #include <stdlib.h> |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 8 | #include <stdarg.h> |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 9 | #include <errno.h> |
| 10 | #include <signal.h> |
| 11 | #include <strings.h> |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 12 | #include <as-layout.h> |
| 13 | #include <kern_util.h> |
| 14 | #include <os.h> |
| 15 | #include <sysdep/mcontext.h> |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 16 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Sergei Trofimovich | 72383d4 | 2012-12-30 01:37:31 +0300 | [diff] [blame] | 18 | void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = { |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 19 | [SIGTRAP] = relay_signal, |
| 20 | [SIGFPE] = relay_signal, |
| 21 | [SIGILL] = relay_signal, |
| 22 | [SIGWINCH] = winch, |
| 23 | [SIGBUS] = bus_handler, |
| 24 | [SIGSEGV] = segv_handler, |
| 25 | [SIGIO] = sigio_handler, |
| 26 | [SIGVTALRM] = timer_handler }; |
| 27 | |
Richard Weinberger | 9a8c135 | 2013-07-19 11:31:36 +0200 | [diff] [blame] | 28 | static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc) |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 29 | { |
Jeff Dike | e6a2d1f | 2008-02-04 22:31:13 -0800 | [diff] [blame] | 30 | struct uml_pt_regs r; |
| 31 | int save_errno = errno; |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 32 | |
Jeff Dike | e6a2d1f | 2008-02-04 22:31:13 -0800 | [diff] [blame] | 33 | r.is_user = 0; |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 34 | if (sig == SIGSEGV) { |
Jeff Dike | e6a2d1f | 2008-02-04 22:31:13 -0800 | [diff] [blame] | 35 | /* For segfaults, we want the data from the sigcontext. */ |
Al Viro | ab1c0cc | 2011-08-18 20:05:19 +0100 | [diff] [blame] | 36 | get_regs_from_mc(&r, mc); |
Al Viro | 248b74c | 2011-08-18 20:05:09 +0100 | [diff] [blame] | 37 | GET_FAULTINFO_FROM_MC(r.faultinfo, mc); |
Jeff Dike | e6a2d1f | 2008-02-04 22:31:13 -0800 | [diff] [blame] | 38 | } |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 39 | |
Jeff Dike | e6a2d1f | 2008-02-04 22:31:13 -0800 | [diff] [blame] | 40 | /* enable signals if sig isn't IRQ signal */ |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 41 | if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM)) |
| 42 | unblock_signals(); |
| 43 | |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 44 | (*sig_info[sig])(sig, si, &r); |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 45 | |
| 46 | errno = save_errno; |
Jeff Dike | 75ada8f | 2008-02-04 22:31:12 -0800 | [diff] [blame] | 47 | } |
| 48 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 49 | /* |
Jeff Dike | 61b63c5 | 2007-10-16 01:27:27 -0700 | [diff] [blame] | 50 | * These are the asynchronous signals. SIGPROF is excluded because we want to |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 51 | * be able to profile all of UML, not just the non-critical sections. If |
| 52 | * profiling is not thread-safe, then that is not my problem. We can disable |
| 53 | * profiling when SMP is enabled in that case. |
| 54 | */ |
| 55 | #define SIGIO_BIT 0 |
| 56 | #define SIGIO_MASK (1 << SIGIO_BIT) |
| 57 | |
| 58 | #define SIGVTALRM_BIT 1 |
| 59 | #define SIGVTALRM_MASK (1 << SIGVTALRM_BIT) |
| 60 | |
Jeff Dike | fce8c41 | 2008-02-04 22:31:09 -0800 | [diff] [blame] | 61 | static int signals_enabled; |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 62 | static unsigned int signals_pending; |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 63 | |
Richard Weinberger | 9a8c135 | 2013-07-19 11:31:36 +0200 | [diff] [blame] | 64 | void sig_handler(int sig, struct siginfo *si, mcontext_t *mc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 66 | int enabled; |
| 67 | |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 68 | enabled = signals_enabled; |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 69 | if (!enabled && (sig == SIGIO)) { |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 70 | signals_pending |= SIGIO_MASK; |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 71 | return; |
| 72 | } |
| 73 | |
| 74 | block_signals(); |
| 75 | |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 76 | sig_handler_common(sig, si, mc); |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 77 | |
| 78 | set_signals(enabled); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
Al Viro | 248b74c | 2011-08-18 20:05:09 +0100 | [diff] [blame] | 81 | static void real_alarm_handler(mcontext_t *mc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 83 | struct uml_pt_regs regs; |
Jeff Dike | 2ea5bc5 | 2007-05-10 22:22:32 -0700 | [diff] [blame] | 84 | |
Al Viro | 248b74c | 2011-08-18 20:05:09 +0100 | [diff] [blame] | 85 | if (mc != NULL) |
Al Viro | ab1c0cc | 2011-08-18 20:05:19 +0100 | [diff] [blame] | 86 | get_regs_from_mc(®s, mc); |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 87 | regs.is_user = 0; |
Jeff Dike | 2ea5bc5 | 2007-05-10 22:22:32 -0700 | [diff] [blame] | 88 | unblock_signals(); |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 89 | timer_handler(SIGVTALRM, NULL, ®s); |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 90 | } |
| 91 | |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 92 | void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 93 | { |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 94 | int enabled; |
| 95 | |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 96 | enabled = signals_enabled; |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 97 | if (!signals_enabled) { |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 98 | signals_pending |= SIGVTALRM_MASK; |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 99 | return; |
| 100 | } |
| 101 | |
| 102 | block_signals(); |
| 103 | |
Al Viro | 248b74c | 2011-08-18 20:05:09 +0100 | [diff] [blame] | 104 | real_alarm_handler(mc); |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 105 | set_signals(enabled); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
Jeff Dike | 78a26e2 | 2007-10-16 01:27:23 -0700 | [diff] [blame] | 108 | void timer_init(void) |
| 109 | { |
Al Viro | 0036168 | 2011-08-18 20:04:39 +0100 | [diff] [blame] | 110 | set_handler(SIGVTALRM); |
Jeff Dike | 78a26e2 | 2007-10-16 01:27:23 -0700 | [diff] [blame] | 111 | } |
| 112 | |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 113 | void set_sigstack(void *sig_stack, int size) |
| 114 | { |
| 115 | stack_t stack = ((stack_t) { .ss_flags = 0, |
| 116 | .ss_sp = (__ptr_t) sig_stack, |
| 117 | .ss_size = size - sizeof(void *) }); |
| 118 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 119 | if (sigaltstack(&stack, NULL) != 0) |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 120 | panic("enabling signal stack failed, errno = %d\n", errno); |
| 121 | } |
| 122 | |
Richard Weinberger | 9a8c135 | 2013-07-19 11:31:36 +0200 | [diff] [blame] | 123 | static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = { |
Al Viro | 0036168 | 2011-08-18 20:04:39 +0100 | [diff] [blame] | 124 | [SIGSEGV] = sig_handler, |
| 125 | [SIGBUS] = sig_handler, |
| 126 | [SIGILL] = sig_handler, |
| 127 | [SIGFPE] = sig_handler, |
| 128 | [SIGTRAP] = sig_handler, |
| 129 | |
| 130 | [SIGIO] = sig_handler, |
| 131 | [SIGWINCH] = sig_handler, |
| 132 | [SIGVTALRM] = alarm_handler |
| 133 | }; |
Jeff Dike | 4b84c69 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 134 | |
Al Viro | 248b74c | 2011-08-18 20:05:09 +0100 | [diff] [blame] | 135 | |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 136 | static void hard_handler(int sig, siginfo_t *si, void *p) |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 137 | { |
Al Viro | 248b74c | 2011-08-18 20:05:09 +0100 | [diff] [blame] | 138 | struct ucontext *uc = p; |
| 139 | mcontext_t *mc = &uc->uc_mcontext; |
Jeff Dike | 508a927 | 2007-09-18 22:46:49 -0700 | [diff] [blame] | 140 | unsigned long pending = 1UL << sig; |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 141 | |
| 142 | do { |
| 143 | int nested, bail; |
| 144 | |
| 145 | /* |
| 146 | * pending comes back with one bit set for each |
| 147 | * interrupt that arrived while setting up the stack, |
| 148 | * plus a bit for this interrupt, plus the zero bit is |
| 149 | * set if this is a nested interrupt. |
| 150 | * If bail is true, then we interrupted another |
| 151 | * handler setting up the stack. In this case, we |
| 152 | * have to return, and the upper handler will deal |
| 153 | * with this interrupt. |
| 154 | */ |
Jeff Dike | 508a927 | 2007-09-18 22:46:49 -0700 | [diff] [blame] | 155 | bail = to_irq_stack(&pending); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 156 | if (bail) |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 157 | return; |
| 158 | |
| 159 | nested = pending & 1; |
| 160 | pending &= ~1; |
| 161 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 162 | while ((sig = ffs(pending)) != 0){ |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 163 | sig--; |
| 164 | pending &= ~(1 << sig); |
Richard Weinberger | 9a8c135 | 2013-07-19 11:31:36 +0200 | [diff] [blame] | 165 | (*handlers[sig])(sig, (struct siginfo *)si, mc); |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 168 | /* |
| 169 | * Again, pending comes back with a mask of signals |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 170 | * that arrived while tearing down the stack. If this |
| 171 | * is non-zero, we just go back, set up the stack |
| 172 | * again, and handle the new interrupts. |
| 173 | */ |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 174 | if (!nested) |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 175 | pending = from_irq_stack(nested); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 176 | } while (pending); |
Jeff Dike | c14b849 | 2007-05-10 22:22:34 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Al Viro | 0036168 | 2011-08-18 20:04:39 +0100 | [diff] [blame] | 179 | void set_handler(int sig) |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 180 | { |
| 181 | struct sigaction action; |
Al Viro | e87df98 | 2011-08-18 20:04:29 +0100 | [diff] [blame] | 182 | int flags = SA_SIGINFO | SA_ONSTACK; |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 183 | sigset_t sig_mask; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 184 | |
Al Viro | 7eb1225 | 2011-08-18 20:03:39 +0100 | [diff] [blame] | 185 | action.sa_sigaction = hard_handler; |
Jeff Dike | 4b84c69 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 186 | |
Al Viro | e87df98 | 2011-08-18 20:04:29 +0100 | [diff] [blame] | 187 | /* block irq ones */ |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 188 | sigemptyset(&action.sa_mask); |
Al Viro | e87df98 | 2011-08-18 20:04:29 +0100 | [diff] [blame] | 189 | sigaddset(&action.sa_mask, SIGVTALRM); |
| 190 | sigaddset(&action.sa_mask, SIGIO); |
| 191 | sigaddset(&action.sa_mask, SIGWINCH); |
Jeff Dike | 4b84c69 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 192 | |
Jeff Dike | e6a2d1f | 2008-02-04 22:31:13 -0800 | [diff] [blame] | 193 | if (sig == SIGSEGV) |
| 194 | flags |= SA_NODEFER; |
| 195 | |
Al Viro | e87df98 | 2011-08-18 20:04:29 +0100 | [diff] [blame] | 196 | if (sigismember(&action.sa_mask, sig)) |
| 197 | flags |= SA_RESTART; /* if it's an irq signal */ |
| 198 | |
| 199 | action.sa_flags = flags; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 200 | action.sa_restorer = NULL; |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 201 | if (sigaction(sig, &action, NULL) < 0) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 202 | panic("sigaction failed - errno = %d\n", errno); |
| 203 | |
| 204 | sigemptyset(&sig_mask); |
| 205 | sigaddset(&sig_mask, sig); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 206 | if (sigprocmask(SIG_UNBLOCK, &sig_mask, NULL) < 0) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 207 | panic("sigprocmask failed - errno = %d\n", errno); |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | int change_sig(int signal, int on) |
| 211 | { |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 212 | sigset_t sigset; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 213 | |
| 214 | sigemptyset(&sigset); |
| 215 | sigaddset(&sigset, signal); |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 216 | if (sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, NULL) < 0) |
WANG Cong | c9a3072 | 2008-02-04 22:30:35 -0800 | [diff] [blame] | 217 | return -errno; |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 218 | |
| 219 | return 0; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 220 | } |
| 221 | |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 222 | void block_signals(void) |
| 223 | { |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 224 | signals_enabled = 0; |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 225 | /* |
| 226 | * This must return with signals disabled, so this barrier |
Jeff Dike | 53b1733 | 2006-11-02 22:07:22 -0800 | [diff] [blame] | 227 | * ensures that writes are flushed out before the return. |
| 228 | * This might matter if gcc figures out how to inline this and |
| 229 | * decides to shuffle this code into the caller. |
| 230 | */ |
Jeff Dike | fce8c41 | 2008-02-04 22:31:09 -0800 | [diff] [blame] | 231 | barrier(); |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | void unblock_signals(void) |
| 235 | { |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 236 | int save_pending; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 237 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 238 | if (signals_enabled == 1) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 239 | return; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 240 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 241 | /* |
| 242 | * We loop because the IRQ handler returns with interrupts off. So, |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 243 | * interrupts may have arrived and we need to re-enable them and |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 244 | * recheck signals_pending. |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 245 | */ |
Jeff Dike | 5134d8f | 2008-02-08 04:22:08 -0800 | [diff] [blame] | 246 | while (1) { |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 247 | /* |
| 248 | * Save and reset save_pending after enabling signals. This |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 249 | * way, signals_pending won't be changed while we're reading it. |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 250 | */ |
| 251 | signals_enabled = 1; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 252 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 253 | /* |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 254 | * Setting signals_enabled and reading signals_pending must |
Jeff Dike | 53b1733 | 2006-11-02 22:07:22 -0800 | [diff] [blame] | 255 | * happen in this order. |
| 256 | */ |
Jeff Dike | fce8c41 | 2008-02-04 22:31:09 -0800 | [diff] [blame] | 257 | barrier(); |
Jeff Dike | 53b1733 | 2006-11-02 22:07:22 -0800 | [diff] [blame] | 258 | |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 259 | save_pending = signals_pending; |
Jeff Dike | fce8c41 | 2008-02-04 22:31:09 -0800 | [diff] [blame] | 260 | if (save_pending == 0) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 261 | return; |
| 262 | |
Jeff Dike | cfef8f3 | 2008-02-04 22:31:16 -0800 | [diff] [blame] | 263 | signals_pending = 0; |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 264 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 265 | /* |
| 266 | * We have pending interrupts, so disable signals, as the |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 267 | * handlers expect them off when they are called. They will |
| 268 | * be enabled again above. |
| 269 | */ |
| 270 | |
| 271 | signals_enabled = 0; |
| 272 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 273 | /* |
| 274 | * Deal with SIGIO first because the alarm handler might |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 275 | * schedule, leaving the pending SIGIO stranded until we come |
| 276 | * back here. |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 277 | * |
| 278 | * SIGIO's handler doesn't use siginfo or mcontext, |
| 279 | * so they can be NULL. |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 280 | */ |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 281 | if (save_pending & SIGIO_MASK) |
Martin Pärtel | d3c1cfc | 2012-08-02 00:49:17 +0200 | [diff] [blame] | 282 | sig_handler_common(SIGIO, NULL, NULL); |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 283 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 284 | if (save_pending & SIGVTALRM_MASK) |
Jeff Dike | 61b63c5 | 2007-10-16 01:27:27 -0700 | [diff] [blame] | 285 | real_alarm_handler(NULL); |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 286 | } |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | int get_signals(void) |
| 290 | { |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 291 | return signals_enabled; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | int set_signals(int enable) |
| 295 | { |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 296 | int ret; |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 297 | if (signals_enabled == enable) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 298 | return enable; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 299 | |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 300 | ret = signals_enabled; |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 301 | if (enable) |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 302 | unblock_signals(); |
| 303 | else block_signals(); |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 304 | |
Jeff Dike | 1d7173b | 2006-01-18 17:42:49 -0800 | [diff] [blame] | 305 | return ret; |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 306 | } |