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34 * @(#)signal.h 8.4 (Berkeley) 5/4/95
35 * $FreeBSD: src/sys/sys/signal.h,v 1.45 2004/06/11 11:43:46 phk Exp $
38 #ifndef _SYS_SIGNAL_H_
39 #define _SYS_SIGNAL_H_
41 #include <sys/cdefs.h>
42 #include <sys/_types.h>
43 #include <sys/_sigset.h>
45 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
48 * System defined signals.
50 #define SIGHUP 1 /* hangup */
51 #define SIGINT 2 /* interrupt */
52 #define SIGQUIT 3 /* quit */
53 #define SIGILL 4 /* illegal instr. (not reset when caught) */
54 #define SIGTRAP 5 /* trace trap (not reset when caught) */
55 #define SIGABRT 6 /* abort() */
56 #define SIGIOT SIGABRT /* compatibility */
57 #define SIGEMT 7 /* EMT instruction */
58 #define SIGFPE 8 /* floating point exception */
59 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
60 #define SIGBUS 10 /* bus error */
61 #define SIGSEGV 11 /* segmentation violation */
62 #define SIGSYS 12 /* non-existent system call invoked */
63 #define SIGPIPE 13 /* write on a pipe with no one to read it */
64 #define SIGALRM 14 /* alarm clock */
65 #define SIGTERM 15 /* software termination signal from kill */
66 #define SIGURG 16 /* urgent condition on IO channel */
67 #define SIGSTOP 17 /* sendable stop signal not from tty */
68 #define SIGTSTP 18 /* stop signal from tty */
69 #define SIGCONT 19 /* continue a stopped process */
70 #define SIGCHLD 20 /* to parent on child stop or exit */
71 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
72 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
73 #define SIGIO 23 /* input/output possible signal */
74 #define SIGXCPU 24 /* exceeded CPU time limit */
75 #define SIGXFSZ 25 /* exceeded file size limit */
76 #define SIGVTALRM 26 /* virtual time alarm */
77 #define SIGPROF 27 /* profiling time alarm */
78 #define SIGWINCH 28 /* window size changes */
79 #define SIGINFO 29 /* information request */
80 #define SIGUSR1 30 /* user defined signal 1 */
81 #define SIGUSR2 31 /* user defined signal 2 */
82 #define SIGTHR 32 /* Thread interrupt. */
85 * XXX missing SIGRTMIN, SIGRTMAX.
88 #define SIG_DFL ((__sighandler_t *)0)
89 #define SIG_IGN ((__sighandler_t *)1)
90 #define SIG_ERR ((__sighandler_t *)-1)
92 * XXX missing SIG_HOLD.
96 * Type of a signal handling function.
98 * Language spec sez signal handlers take exactly one arg, even though we
99 * actually supply three. Ugh!
101 * We don't try to hide the difference by leaving out the args because
102 * that would cause warnings about conformant programs. Nonconformant
103 * programs can avoid the warnings by casting to (__sighandler_t *) or
104 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
106 * The kernel should reverse the cast before calling the function. It
107 * has no way to do this, but on most machines 1-arg and 3-arg functions
108 * have the same calling protocol so there is no problem in practice.
109 * A bit in sa_flags could be used to specify the number of args.
111 typedef void __sighandler_t(int);
113 #if __POSIX_VISIBLE || __XSI_VISIBLE
114 #ifndef _SIGSET_T_DECLARED
115 #define _SIGSET_T_DECLARED
116 typedef __sigset_t sigset_t;
121 #if __POSIX_VISIBLE || __XSI_VISIBLE
125 * Signal vector "template" used in sigaction call.
129 void (*__sa_handler)(int);
130 void (*__sa_sigaction)(int, struct __siginfo *, void *);
131 } __sigaction_u; /* signal handler */
132 int sa_flags; /* see signal options below */
133 sigset_t sa_mask; /* signal mask to apply */
136 #define sa_handler __sigaction_u.__sa_handler
139 #if __POSIX_VISIBLE || __XSI_VISIBLE
140 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
141 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
144 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
145 #define SA_RESTART 0x0002 /* restart system call on signal return */
146 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
147 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
148 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
149 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
153 #define NSIG 32 /* number of old signals (counting 0) */
156 #endif /* !_SYS_SIGNAL_H_ */