signal.h revision 41b3179c9ef03ebb447cac7f5e8405dce399cb17 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#ifndef _SIGNAL_H_
29#define _SIGNAL_H_
30
31#include <errno.h>
32#include <sys/cdefs.h>
33#include <limits.h>		/* For LONG_BIT */
34#include <string.h>		/* For memset() */
35#include <sys/types.h>
36#include <asm/signal.h>
37
38#define __ARCH_SI_UID_T __kernel_uid32_t
39#include <asm/siginfo.h>
40#undef __ARCH_SI_UID_T
41
42__BEGIN_DECLS
43
44typedef int sig_atomic_t;
45
46/* _NSIG is used by the SIGRTMAX definition under <asm/signal.h>, however
47 * its definition is part of a #if __KERNEL__ .. #endif block in the original
48 * kernel headers and is thus not part of our cleaned-up versions.
49 *
50 * Looking at the current kernel sources, it is defined as 64 for all
51 * architectures except for the 'mips' one which set it to 128.
52 */
53#ifndef _NSIG
54#  define _NSIG  64
55#endif
56
57extern const char* const sys_siglist[];
58extern const char* const sys_signame[];
59
60static __inline__ int sigismember(const sigset_t* set, int signum) {
61  int bit = signum - 1; // Signal numbers start at 1, but bit positions start at 0.
62  if (set == NULL || bit < 0 || bit >= (int) (8*sizeof(sigset_t))) {
63    errno = EINVAL;
64    return -1;
65  }
66  const unsigned long* local_set = (const unsigned long*) set;
67  return (int) ((local_set[bit / LONG_BIT] >> (bit % LONG_BIT)) & 1);
68}
69
70static __inline__ int sigaddset(sigset_t* set, int signum) {
71  int bit = signum - 1; // Signal numbers start at 1, but bit positions start at 0.
72  if (set == NULL || bit < 0 || bit >= (int) (8*sizeof(sigset_t))) {
73    errno = EINVAL;
74    return -1;
75  }
76  unsigned long* local_set = (unsigned long*) set;
77  local_set[bit / LONG_BIT] |= 1UL << (bit % LONG_BIT);
78  return 0;
79}
80
81static __inline__ int sigdelset(sigset_t* set, int signum) {
82  int bit = signum - 1; // Signal numbers start at 1, but bit positions start at 0.
83  if (set == NULL || bit < 0 || bit >= (int) (8*sizeof(sigset_t))) {
84    errno = EINVAL;
85    return -1;
86  }
87  unsigned long* local_set = (unsigned long*) set;
88  local_set[bit / LONG_BIT] &= ~(1UL << (bit % LONG_BIT));
89  return 0;
90}
91
92static __inline__ int sigemptyset(sigset_t* set) {
93  if (set == NULL) {
94    errno = EINVAL;
95    return -1;
96  }
97  memset(set, 0, sizeof *set);
98  return 0;
99}
100
101static __inline__ int sigfillset(sigset_t* set) {
102  if (set == NULL) {
103    errno = EINVAL;
104    return -1;
105  }
106  memset(set, ~0, sizeof *set);
107  return 0;
108}
109
110
111/* compatibility types */
112typedef void  (*sig_t)(int);
113typedef sig_t sighandler_t;
114
115/* differentiater between sysv and bsd behaviour 8*/
116extern __sighandler_t sysv_signal(int, __sighandler_t);
117extern __sighandler_t bsd_signal(int, __sighandler_t);
118
119/* the default is bsd */
120static __inline__ __sighandler_t signal(int s, __sighandler_t f)
121{
122    return bsd_signal(s,f);
123}
124
125/* the syscall itself */
126extern __sighandler_t __signal(int, __sighandler_t, int);
127
128extern int sigprocmask(int, const sigset_t *, sigset_t *);
129extern int sigaction(int, const struct sigaction *, struct sigaction *);
130
131extern int sigpending(sigset_t *);
132extern int sigsuspend(const sigset_t *);
133extern int sigwait(const sigset_t *set, int *sig);
134extern int siginterrupt(int  sig, int  flag);
135
136extern int raise(int);
137extern int kill(pid_t, int);
138extern int killpg(int pgrp, int sig);
139extern int sigaltstack(const stack_t *ss, stack_t *oss);
140
141extern void psiginfo(const siginfo_t* si, const char* message);
142extern void psignal(int signal_number, const char* message);
143
144__END_DECLS
145
146#endif /* _SIGNAL_H_ */
147