source: trunk/minix/include/signal.h@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 4.8 KB
Line 
1/* The <signal.h> header defines all the ANSI and POSIX signals.
2 * MINIX supports all the signals required by POSIX. They are defined below.
3 * Some additional signals are also supported.
4 */
5
6#ifndef _SIGNAL_H
7#define _SIGNAL_H
8
9#ifndef _ANSI_H
10#include <ansi.h>
11#endif
12#ifdef _POSIX_SOURCE
13#ifndef _TYPES_H
14#include <sys/types.h>
15#endif
16#endif
17
18/* Here are types that are closely associated with signal handling. */
19typedef int sig_atomic_t;
20
21#ifdef _POSIX_SOURCE
22#ifndef _SIGSET_T
23#define _SIGSET_T
24typedef unsigned long sigset_t;
25#endif
26#endif
27
28/* Regular signals. */
29#define SIGHUP 1 /* hangup */
30#define SIGINT 2 /* interrupt (DEL) */
31#define SIGQUIT 3 /* quit (ASCII FS) */
32#define SIGILL 4 /* illegal instruction */
33#define SIGTRAP 5 /* trace trap (not reset when caught) */
34#define SIGABRT 6 /* IOT instruction */
35#define SIGBUS 7 /* bus error */
36#define SIGFPE 8 /* floating point exception */
37#define SIGKILL 9 /* kill (cannot be caught or ignored) */
38#define SIGUSR1 10 /* user defined signal # 1 */
39#define SIGSEGV 11 /* segmentation violation */
40#define SIGUSR2 12 /* user defined signal # 2 */
41#define SIGPIPE 13 /* write on a pipe with no one to read it */
42#define SIGALRM 14 /* alarm clock */
43#define SIGTERM 15 /* software termination signal from kill */
44#define SIGEMT 16 /* EMT instruction */
45#define SIGCHLD 17 /* child process terminated or stopped */
46#define SIGWINCH 21 /* window size has changed */
47
48/* POSIX requires the following signals to be defined, even if they are
49 * not supported. Here are the definitions, but they are not supported.
50 */
51#define SIGCONT 18 /* continue if stopped */
52#define SIGSTOP 19 /* stop signal */
53#define SIGTSTP 20 /* interactive stop signal */
54#define SIGTTIN 22 /* background process wants to read */
55#define SIGTTOU 23 /* background process wants to write */
56
57#define _NSIG 23 /* number of signals used */
58
59#ifdef _MINIX
60#define SIGIOT SIGABRT /* for people who speak PDP-11 */
61
62/* MINIX specific signals. These signals are not used by user proceses,
63 * but meant to inform system processes, like the PM, about system events.
64 */
65#define SIGKMESS 29 /* new kernel message */
66#define SIGKSIG 30 /* kernel signal pending */
67#define SIGKSTOP 31 /* kernel shutting down */
68
69#endif
70
71/* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
72typedef void _PROTOTYPE( (*__sighandler_t), (int) );
73
74/* Macros used as function pointers. */
75#define SIG_ERR ((__sighandler_t) -1) /* error return */
76#define SIG_DFL ((__sighandler_t) 0) /* default signal handling */
77#define SIG_IGN ((__sighandler_t) 1) /* ignore signal */
78#define SIG_HOLD ((__sighandler_t) 2) /* block signal */
79#define SIG_CATCH ((__sighandler_t) 3) /* catch signal */
80#define SIG_MESS ((__sighandler_t) 4) /* pass as message (MINIX) */
81
82#ifdef _POSIX_SOURCE
83struct sigaction {
84 __sighandler_t sa_handler; /* SIG_DFL, SIG_IGN, or pointer to function */
85 sigset_t sa_mask; /* signals to be blocked during handler */
86 int sa_flags; /* special flags */
87};
88
89/* Fields for sa_flags. */
90#define SA_ONSTACK 0x0001 /* deliver signal on alternate stack */
91#define SA_RESETHAND 0x0002 /* reset signal handler when signal caught */
92#define SA_NODEFER 0x0004 /* don't block signal while catching it */
93#define SA_RESTART 0x0008 /* automatic system call restart */
94#define SA_SIGINFO 0x0010 /* extended signal handling */
95#define SA_NOCLDWAIT 0x0020 /* don't create zombies */
96#define SA_NOCLDSTOP 0x0040 /* don't receive SIGCHLD when child stops */
97
98/* POSIX requires these values for use with sigprocmask(2). */
99#define SIG_BLOCK 0 /* for blocking signals */
100#define SIG_UNBLOCK 1 /* for unblocking signals */
101#define SIG_SETMASK 2 /* for setting the signal mask */
102#define SIG_INQUIRE 4 /* for internal use only */
103#endif /* _POSIX_SOURCE */
104
105/* POSIX and ANSI function prototypes. */
106_PROTOTYPE( int raise, (int _sig) );
107_PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func) );
108
109#ifdef _POSIX_SOURCE
110_PROTOTYPE( int kill, (pid_t _pid, int _sig) );
111_PROTOTYPE( int sigaction,
112 (int _sig, const struct sigaction *_act, struct sigaction *_oact) );
113_PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig) );
114_PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig) );
115_PROTOTYPE( int sigemptyset, (sigset_t *_set) );
116_PROTOTYPE( int sigfillset, (sigset_t *_set) );
117_PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig) );
118_PROTOTYPE( int sigpending, (sigset_t *_set) );
119_PROTOTYPE( int sigprocmask,
120 (int _how, const sigset_t *_set, sigset_t *_oset) );
121_PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask) );
122#endif
123
124#endif /* _SIGNAL_H */
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