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minix/include/signal.h
Tomas Hruby f51eea4b32 Changed pagefault delivery to VM 
this patch changes the way pagefaults are delivered to VM. It adopts
the same model as the out-of-quantum messages sent by kernel to a
scheduler.

- everytime a userspace pagefault occurs, kernel creates a message
  which is sent to VM on behalf of the faulting process

- the process is blocked on delivery to VM in the standard IPC code
  instead of waiting in a spacial in-kernel queue (stack) and is not
  runnable until VM tell kernel that the pagefault is resolved and is
  free to clear the RTS_PAGEFAULT flag.

- VM does not need call kernel and poll the pagefault information
  which saves many (1/2?) calls and kernel calls that return "no more
  data"

- VM notification by kernel does not need to use signals

- each entry in proc table is by 12 bytes smaller (~3k save)
2010-04-26 23:21:26 +00:00

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