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
44 typedef 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
57 extern const char* const sys_siglist[];
58 extern const char* const sys_signame[];
59
sigismember(const sigset_t * set,int signum)60 static __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
sigaddset(sigset_t * set,int signum)70 static __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
sigdelset(sigset_t * set,int signum)81 static __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
sigemptyset(sigset_t * set)92 static __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
sigfillset(sigset_t * set)101 static __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 */
112 typedef void (*sig_t)(int);
113 typedef sig_t sighandler_t;
114
115 /* differentiater between sysv and bsd behaviour 8*/
116 extern __sighandler_t sysv_signal(int, __sighandler_t);
117 extern __sighandler_t bsd_signal(int, __sighandler_t);
118
119 /* the default is bsd */
signal(int s,__sighandler_t f)120 static __inline__ __sighandler_t signal(int s, __sighandler_t f)
121 {
122 return bsd_signal(s,f);
123 }
124
125 /* the syscall itself */
126 extern __sighandler_t __signal(int, __sighandler_t, int);
127
128 extern int sigprocmask(int, const sigset_t *, sigset_t *);
129 extern int sigaction(int, const struct sigaction *, struct sigaction *);
130
131 extern int sigpending(sigset_t *);
132 extern int sigsuspend(const sigset_t *);
133 extern int sigwait(const sigset_t *set, int *sig);
134 extern int siginterrupt(int sig, int flag);
135
136 extern int raise(int);
137 extern int kill(pid_t, int);
138 extern int killpg(int pgrp, int sig);
139 extern int sigaltstack(const stack_t *ss, stack_t *oss);
140
141 extern void psiginfo(const siginfo_t* si, const char* message);
142 extern void psignal(int signal_number, const char* message);
143
144 __END_DECLS
145
146 #endif /* _SIGNAL_H_ */
147