signal.h revision 11cd02dfb91661c65134cac258cf5924270e9d2b 
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 <sys/cdefs.h>
32#include <limits.h>		/* For LONG_BIT */
33#include <string.h>		/* For memset() */
34#include <sys/types.h>
35#include <asm/signal.h>
36#include <asm/sigcontext.h>
37
38#define __ARCH_SI_UID_T __kernel_uid32_t
39#include <asm/siginfo.h>
40#undef __ARCH_SI_UID_T
41
42#include <sys/ucontext.h>
43#define __BIONIC_HAVE_UCONTEXT_T
44
45__BEGIN_DECLS
46
47typedef int sig_atomic_t;
48
49/* _NSIG is used by the SIGRTMAX definition under <asm/signal.h>, however
50 * its definition is part of a #if __KERNEL__ .. #endif block in the original
51 * kernel headers and is thus not part of our cleaned-up versions.
52 *
53 * Looking at the current kernel sources, it is defined as 64 for all
54 * architectures except for the 'mips' one which set it to 128.
55 */
56#ifndef _NSIG
57#  define _NSIG  64
58#endif
59
60extern const char * const sys_siglist[];
61extern const char * const sys_signame[];
62
63static __inline__ int sigismember(sigset_t *set, int signum)
64{
65    unsigned long *local_set = (unsigned long *)set;
66    signum--;
67    return (int)((local_set[signum/LONG_BIT] >> (signum%LONG_BIT)) & 1);
68}
69
70
71static __inline__ int sigaddset(sigset_t *set, int signum)
72{
73    unsigned long *local_set = (unsigned long *)set;
74    signum--;
75    local_set[signum/LONG_BIT] |= 1UL << (signum%LONG_BIT);
76    return 0;
77}
78
79
80static __inline__ int sigdelset(sigset_t *set, int signum)
81{
82    unsigned long *local_set = (unsigned long *)set;
83    signum--;
84    local_set[signum/LONG_BIT] &= ~(1UL << (signum%LONG_BIT));
85    return 0;
86}
87
88
89static __inline__ int sigemptyset(sigset_t *set)
90{
91    memset(set, 0, sizeof *set);
92    return 0;
93}
94
95static __inline__ int sigfillset(sigset_t *set)
96{
97    memset(set, ~0, sizeof *set);
98    return 0;
99}
100
101
102/* compatibility types */
103typedef void  (*sig_t)(int);
104typedef sig_t sighandler_t;
105
106/* differentiater between sysv and bsd behaviour 8*/
107extern __sighandler_t sysv_signal(int, __sighandler_t);
108extern __sighandler_t bsd_signal(int, __sighandler_t);
109
110/* the default is bsd */
111static __inline__ __sighandler_t signal(int s, __sighandler_t f)
112{
113    return bsd_signal(s,f);
114}
115
116/* the syscall itself */
117extern __sighandler_t __signal(int, __sighandler_t, int);
118
119extern int sigprocmask(int, const sigset_t *, sigset_t *);
120extern int sigaction(int, const struct sigaction *, struct sigaction *);
121
122extern int sigpending(sigset_t *);
123extern int sigsuspend(const sigset_t *);
124extern int sigwait(const sigset_t *set, int *sig);
125extern int siginterrupt(int  sig, int  flag);
126
127extern int raise(int);
128extern int kill(pid_t, int);
129extern int killpg(int pgrp, int sig);
130extern int sigaltstack(const stack_t *ss, stack_t *oss);
131
132
133__END_DECLS
134
135#endif /* _SIGNAL_H_ */
136