264 lines
8.4 KiB
C
264 lines
8.4 KiB
C
/*
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* Copyright 2002-2007, Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SIGNAL_H_
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#define _SIGNAL_H_
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#include <sys/types.h>
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typedef int sig_atomic_t;
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typedef long sigset_t;
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typedef void (*sighandler_t)(int);
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/* GNU-like signal handler typedef */
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typedef void (*__signal_func_ptr)(int);
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/* deprecated, for compatibility with BeOS only */
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/* macros defining the standard signal handling behavior */
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#define SIG_DFL ((sighandler_t)0) /* "default" signal behaviour */
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#define SIG_IGN ((sighandler_t)1) /* ignore signal */
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#define SIG_ERR ((sighandler_t)-1) /* an error occurred during signal processing */
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#define SIG_HOLD ((sighandler_t)3) /* the signal was hold */
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/* TODO: Support this structure, or more precisely the SA_SIGINFO flag. To do
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* this properly we need real-time signal support. Both are commented out for
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* the time being to not make "configure" scripts think we do support them. */
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#if 0
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typedef struct {
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int si_signo; /* signal number */
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int si_code; /* signal code */
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int si_errno; /* if non zero, an error number associated with this signal */
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pid_t si_pid; /* sending process ID */
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uid_t si_uid; /* real user ID of sending process */
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void *si_addr; /* address of faulting instruction */
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int si_status; /* exit value or signal */
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long si_band; /* band event for SIGPOLL */
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} siginfo_t;
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#endif /* 0 */
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/*
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* structure used by sigaction()
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*
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* Note: the 'sa_userdata' field is a non-POSIX extension.
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* See the documentation for more info on this.
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*/
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struct sigaction {
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sighandler_t sa_handler;
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sigset_t sa_mask;
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int sa_flags;
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void *sa_userdata; /* will be passed to the signal handler */
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};
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/* values for sa_flags */
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#define SA_NOCLDSTOP 0x01
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#define SA_NOCLDWAIT 0x02
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#define SA_RESETHAND 0x04
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#define SA_NODEFER 0x08
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#define SA_RESTART 0x10
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#define SA_ONSTACK 0x20
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/* #define SA_SIGINFO 0x40 */
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#define SA_NOMASK SA_NODEFER
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#define SA_STACK SA_ONSTACK
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#define SA_ONESHOT SA_RESETHAND
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/* values for ss_flags */
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#define SS_ONSTACK 0x1
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#define SS_DISABLE 0x2
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#define MINSIGSTKSZ 4096
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#define SIGSTKSZ 16384
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/*
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* for signals using an alternate stack
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*/
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typedef struct stack_t {
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void *ss_sp;
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size_t ss_size;
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int ss_flags;
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} stack_t;
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typedef struct sigstack {
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int ss_onstack;
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void *ss_sp;
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} sigstack;
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/* for the 'how' arg of sigprocmask() */
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#define SIG_BLOCK 1
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#define SIG_UNBLOCK 2
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#define SIG_SETMASK 3
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/*
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* The list of all defined signals:
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*
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* The numbering of signals for Haiku attempts to maintain
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* some consistency with UN*X conventions so that things
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* like "kill -9" do what you expect.
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*/
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#define SIGHUP 1 /* hangup -- tty is gone! */
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#define SIGINT 2 /* interrupt */
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#define SIGQUIT 3 /* `quit' special character typed in tty */
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#define SIGILL 4 /* illegal instruction */
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#define SIGCHLD 5 /* child process exited */
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#define SIGABRT 6 /* abort() called, dont' catch */
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#define SIGPIPE 7 /* write to a pipe w/no readers */
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#define SIGFPE 8 /* floating point exception */
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#define SIGKILL 9 /* kill a team (not catchable) */
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#define SIGSTOP 10 /* suspend a thread (not catchable) */
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#define SIGSEGV 11 /* segmentation violation (read: invalid pointer) */
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#define SIGCONT 12 /* continue execution if suspended */
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#define SIGTSTP 13 /* `stop' special character typed in tty */
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#define SIGALRM 14 /* an alarm has gone off (see alarm()) */
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#define SIGTERM 15 /* termination requested */
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#define SIGTTIN 16 /* read of tty from bg process */
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#define SIGTTOU 17 /* write to tty from bg process */
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#define SIGUSR1 18 /* app defined signal 1 */
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#define SIGUSR2 19 /* app defined signal 2 */
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#define SIGWINCH 20 /* tty window size changed */
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#define SIGKILLTHR 21 /* be specific: kill just the thread, not team */
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#define SIGTRAP 22 /* Trace/breakpoint trap */
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#define SIGPOLL 23 /* Pollable event */
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#define SIGPROF 24 /* Profiling timer expired */
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#define SIGSYS 25 /* Bad system call */
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#define SIGURG 26 /* High bandwidth data is available at socket */
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#define SIGVTALRM 27 /* Virtual timer expired */
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#define SIGXCPU 28 /* CPU time limit exceeded */
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#define SIGXFSZ 29 /* File size limit exceeded */
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#define SIGBUS SIGSEGV /* for old style code */
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/*
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* Signal numbers 30-32 are currently free but may be used in future
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* releases. Use them at your own peril (if you do use them, at least
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* be smart and use them backwards from signal 32).
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*/
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#define MAX_SIGNO 32 /* the most signals that a single thread can reference */
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#define __signal_max 29 /* the largest signal number that is actually defined */
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#define NSIG (__signal_max+1)
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/* the number of defined signals */
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/* the global table of text strings containing descriptions for each signal */
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extern const char * const sys_siglist[NSIG];
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#ifdef __cplusplus
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extern "C" {
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#endif
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sighandler_t signal(int sig, sighandler_t signalHandler);
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sighandler_t sigset(int sig, sighandler_t signalHandler);
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int raise(int sig);
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int kill(pid_t pid, int sig);
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int send_signal(pid_t tid, unsigned int sig);
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int killpg(pid_t processGroupID, int sig);
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int sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
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int sigprocmask(int how, const sigset_t *set, sigset_t *oset);
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int sigpending(sigset_t *set);
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int sigsuspend(const sigset_t *mask);
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int sigwait(const sigset_t *set, int *sig);
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int sigemptyset(sigset_t *set);
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int sigfillset(sigset_t *set);
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int sigaddset(sigset_t *set, int signo);
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int sigdelset(sigset_t *set, int signo);
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int sigismember(const sigset_t *set, int signo);
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int sigignore(int signo);
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int sighold(int signo);
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int sigrelse(int signo);
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const char *strsignal(int sig);
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void set_signal_stack(void *ptr, size_t size);
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int sigaltstack(const stack_t *ss, stack_t *oss);
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/* pthread extension : equivalent of sigprocmask() */
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int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset);
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#ifdef __cplusplus
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}
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#endif
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/* TODO: move this into the documentation!
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* ==================================================
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* !!! SPECIAL NOTES CONCERNING NON-POSIX EXTENSIONS:
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* ==================================================
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*
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* The standard Posix interface for signal handlers is not as useful
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* as it could be. The handler can define only one single argument
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* (the signal number). For example:
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* void
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* my_signal_handler(int sig)
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* {
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* . . .
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* }
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*
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* // install the handler
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* signal(SIGINT, &my_signal_handler);
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*
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* The sigaction() function allows finer grained control of the signal
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* handling. It also allows an opportunity, via the 'sigaction' struct, to
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* enable additional data to be passed to the handler. For example:
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* void
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* my_signal_handler(int sig, char *userData, vregs regs)
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* {
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* . . .
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* }
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*
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* struct sigaction sa;
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* char data_buffer[32];
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*
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* sa.sa_handler = (sighandler_t)my_signal_handler;
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* sigemptyset(&sa.sa_mask);
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* sa.sa_userdata = userData;
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*
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* // install the handler
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* sigaction(SIGINT, &sa, NULL);
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*
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* The two additional arguments available to the signal handler are extensions
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* to the Posix standard. This feature was introduced by the BeOS and retained
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* by Haiku. However, to remain compatible with Posix and ANSI C, the type
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* of the sa_handler field is defined as 'sighandler_t'. This requires the handler
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* to be cast when assigned to the sa_handler field, as in the example above.
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*
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* The 3 arguments that Haiku provides to signal handlers are as follows:
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* 1) The first argument is the (usual) signal number.
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*
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* 2) The second argument is whatever value is put in the sa_userdata field
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* of the sigaction struct.
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*
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* 3) The third argument is a pointer to a vregs struct (defined below).
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* The vregs struct contains the contents of the volatile registers at
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* the time the signal was delivered to your thread. You can change the fields
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* of the structure. After your signal handler completes, the OS uses this struct
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* to reload the registers for your thread (privileged registers are not loaded
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* of course). The vregs struct is of course terribly machine dependent.
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*/
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/*
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* the vregs struct:
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*
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* signal handlers get this as the last argument
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*/
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typedef struct vregs vregs;
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/* include architecture specific definitions */
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#ifdef __INTEL__
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#include <arch/x86/signal.h>
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#elif __POWERPC__
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#include <arch/ppc/signal.h>
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#elif __M68K__
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#include <arch/m68k/signal.h>
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#else
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#error #include <arch/<cpu>/signal.h>
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#endif
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#endif /* _SIGNAL_H_ */
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