189 lines
7.4 KiB
C
189 lines
7.4 KiB
C
/* The <signal.h> header defines all the ANSI and POSIX signals.
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* MINIX supports all the signals required by POSIX. They are defined below.
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* Some additional signals are also supported.
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*/
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#ifndef _SIGNAL_H
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#define _SIGNAL_H
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#ifndef _MINIX_ANSI_H
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#include <minix/ansi.h>
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#endif
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#ifdef _POSIX_SOURCE
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#ifndef _TYPES_H
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#include <minix/types.h>
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#endif
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#endif
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/* Here are types that are closely associated with signal handling. */
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typedef int sig_atomic_t;
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#ifdef _POSIX_SOURCE
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#ifndef _SIGSET_T
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#define _SIGSET_T
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typedef unsigned long sigset_t;
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#endif
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#endif
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/* Regular signals. */
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#define SIGHUP 1 /* hangup */
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#define SIGINT 2 /* interrupt (DEL) */
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#define SIGQUIT 3 /* quit (ASCII FS) */
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#define SIGILL 4 /* illegal instruction */
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#define SIGTRAP 5 /* trace trap (not reset when caught) */
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#define SIGABRT 6 /* IOT instruction */
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#define SIGBUS 7 /* bus error */
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#define SIGFPE 8 /* floating point exception */
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#define SIGKILL 9 /* kill (cannot be caught or ignored) */
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#define SIGUSR1 10 /* user defined signal # 1 */
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#define SIGSEGV 11 /* segmentation violation */
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#define SIGUSR2 12 /* user defined signal # 2 */
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#define SIGPIPE 13 /* write on a pipe with no one to read it */
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#define SIGALRM 14 /* alarm clock */
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#define SIGTERM 15 /* software termination signal from kill */
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#define SIGEMT 16 /* EMT instruction */
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#define SIGCHLD 17 /* child process terminated or stopped */
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#define SIGWINCH 21 /* window size has changed */
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#define SIGVTALRM 24 /* virtual alarm */
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#define SIGPROF 25 /* profiler alarm */
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/* POSIX requires the following signals to be defined, even if they are
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* not supported. Here are the definitions, but they are not supported.
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*/
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#define SIGCONT 18 /* continue if stopped */
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#define SIGSTOP 19 /* stop signal */
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#define SIGTSTP 20 /* interactive stop signal */
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#define SIGTTIN 22 /* background process wants to read */
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#define SIGTTOU 23 /* background process wants to write */
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#define _NSIG 26 /* highest signal number plus one */
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#define NSIG _NSIG
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#ifdef _MINIX
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#define SIGIOT SIGABRT /* for people who speak PDP-11 */
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/* MINIX specific signals. These signals are not used by user proceses,
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* but meant to inform system processes, like the PM, about system events.
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* The order here determines the order signals are processed by system
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* processes in user-space. Higher-priority signals should be first.
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*/
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/* Signals delivered by a signal manager. */
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#define SIGSNDELAY 26 /* end of delay for signal delivery */
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#define SIGS_FIRST SIGHUP /* first system signal */
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#define SIGS_LAST SIGSNDELAY /* last system signal */
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#define IS_SIGS(signo) (signo>=SIGS_FIRST && signo<=SIGS_LAST)
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/* Signals delivered by the kernel. */
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#define SIGKMEM 27 /* kernel memory request pending */
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#define SIGKMESS 28 /* new kernel message */
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#define SIGKSIGSM 29 /* kernel signal pending for signal manager */
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#define SIGKSIG 30 /* kernel signal pending */
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#define SIGK_FIRST SIGKMEM /* first kernel signal */
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#define SIGK_LAST SIGKSIG /* last kernel signal */
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#define IS_SIGK(signo) (signo>=SIGK_FIRST && signo<=SIGK_LAST)
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/* Termination signals for Minix system processes. */
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#define SIGS_IS_LETHAL(sig) \
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(sig == SIGILL || sig == SIGBUS || sig == SIGFPE || sig == SIGSEGV \
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|| sig == SIGEMT || sig == SIGABRT)
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#define SIGS_IS_TERMINATION(sig) (SIGS_IS_LETHAL(sig) \
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|| (sig == SIGKILL || sig == SIGPIPE))
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#define SIGS_IS_STACKTRACE(sig) (SIGS_IS_LETHAL(sig) && sig != SIGABRT)
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#endif
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/* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
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typedef void _PROTOTYPE( (*__sighandler_t), (int) );
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/* Macros used as function pointers. */
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#define SIG_ERR ((__sighandler_t) -1) /* error return */
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#define SIG_DFL ((__sighandler_t) 0) /* default signal handling */
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#define SIG_IGN ((__sighandler_t) 1) /* ignore signal */
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#define SIG_HOLD ((__sighandler_t) 2) /* block signal */
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#define SIG_CATCH ((__sighandler_t) 3) /* catch signal */
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#ifdef _POSIX_SOURCE
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struct sigaction {
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__sighandler_t sa_handler; /* SIG_DFL, SIG_IGN, or pointer to function */
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sigset_t sa_mask; /* signals to be blocked during handler */
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int sa_flags; /* special flags */
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};
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/* Fields for sa_flags. */
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#define SA_ONSTACK 0x0001 /* deliver signal on alternate stack */
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#define SA_RESETHAND 0x0002 /* reset signal handler when signal caught */
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#define SA_NODEFER 0x0004 /* don't block signal while catching it */
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#define SA_RESTART 0x0008 /* automatic system call restart */
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#define SA_SIGINFO 0x0010 /* extended signal handling */
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#define SA_NOCLDWAIT 0x0020 /* don't create zombies */
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#define SA_NOCLDSTOP 0x0040 /* don't receive SIGCHLD when child stops */
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/* POSIX requires these values for use with sigprocmask(2). */
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#define SIG_BLOCK 0 /* for blocking signals */
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#define SIG_UNBLOCK 1 /* for unblocking signals */
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#define SIG_SETMASK 2 /* for setting the signal mask */
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#define SIG_INQUIRE 4 /* for internal use only */
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/* codes for SIGFPE */
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#define FPE_INTOVF 1 /* integer divide by zero */
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#define FPE_INTDIV 2 /* integer overflow */
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#define FPE_FLTDIV 3 /* floating-point divide by zero */
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#define FPE_FLTOVF 4 /* floating-point overflow */
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#define FPE_FLTUND 5 /* floating-point underflow */
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#define FPE_FLTRES 6 /* floating-point inexact result */
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#define FPE_FLTINV 7 /* floating-point invalid operation */
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#define FPE_FLTSUB 8 /* subscript out of range */
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typedef struct sigaltstack {
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void *ss_sp;
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int ss_flags;
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size_t ss_size;
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} stack_t;
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#define MINSIGSTKSZ 2048 /* Minimal stack size is 2k */
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/* Fields for ss_flags */
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#define SS_ONSTACK 1 /* Process is executing on an alternate stack */
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#define SS_DISABLE 2 /* Alternate stack is disabled */
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#endif /* _POSIX_SOURCE */
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/* POSIX and ANSI function prototypes. */
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_PROTOTYPE( int raise, (int _sig) );
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_PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func) );
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#ifdef _POSIX_SOURCE
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_PROTOTYPE( int kill, (pid_t _pid, int _sig) );
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_PROTOTYPE( int killpg, (pid_t _pgrp, int _sig) );
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_PROTOTYPE( int sigaction,
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(int _sig, const struct sigaction *_act, struct sigaction *_oact) );
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_PROTOTYPE( int sigpending, (sigset_t *_set) );
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_PROTOTYPE( int sigprocmask,
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(int _how, const sigset_t *_set, sigset_t *_oset) );
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_PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask) );
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/* For the sigset functions, only use the library version with error
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* checking from user programs. System programs need to be able to use
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* nonstanard signals.
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*/
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#ifndef _SYSTEM
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_PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig) );
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_PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig) );
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_PROTOTYPE( int sigemptyset, (sigset_t *_set) );
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_PROTOTYPE( int sigfillset, (sigset_t *_set) );
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_PROTOTYPE( int sigismember, (const sigset_t *_set, int _sig) );
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#else
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#define sigaddset(set, sig) ((int) ((*(set) |= (1 << (sig))) && 0))
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#define sigdelset(set, sig) ((int) ((*(set) &= ~(1 << (sig))) && 0))
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#define sigemptyset(set) ((int) (*(set) = 0))
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#define sigfillset(set) ((int) ((*(set) = ~0) && 0))
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#define sigismember(set, sig) ((*(set) & (1 << (sig))) ? 1 : 0)
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#endif
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#endif
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#endif /* _SIGNAL_H */
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