2005-04-21 16:53:53 +02:00
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/* 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 _ANSI_H
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#include <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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2009-11-06 09:46:22 +01:00
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#include <minix/types.h>
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2005-04-21 16:53:53 +02:00
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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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2006-03-10 17:10:05 +01:00
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/* Regular signals. */
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2005-04-21 16:53:53 +02:00
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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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2006-02-17 14:43:07 +01:00
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#define SIGBUS 7 /* bus error */
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2005-04-21 16:53:53 +02:00
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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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2006-02-17 15:12:12 +01:00
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#define SIGEMT 16 /* EMT instruction */
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2005-04-21 16:53:53 +02:00
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#define SIGCHLD 17 /* child process terminated or stopped */
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2006-03-10 17:10:05 +01:00
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#define SIGWINCH 21 /* window size has changed */
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2009-08-15 23:37:26 +02:00
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#define SIGVTALRM 24 /* virtual alarm */
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#define SIGPROF 25 /* profiler alarm */
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2005-04-21 16:53:53 +02:00
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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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2006-03-15 11:18:59 +01:00
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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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2009-08-15 23:37:26 +02:00
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#define _NSIG 26 /* highest signal number plus one */
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2005-04-21 16:53:53 +02:00
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2006-02-17 14:43:07 +01:00
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#ifdef _MINIX
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#define SIGIOT SIGABRT /* for people who speak PDP-11 */
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2006-03-15 11:18:59 +01:00
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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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*/
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#define SIGKMESS 29 /* new kernel message */
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#define SIGKSIG 30 /* kernel signal pending */
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2009-10-01 12:36:09 +02:00
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#define SIGNDELAY 31 /* end of delay for signal delivery */
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2006-03-15 11:18:59 +01:00
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2006-02-17 14:43:07 +01:00
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#endif
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2005-04-21 16:53:53 +02:00
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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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2005-07-19 14:24:51 +02:00
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#define SIG_MESS ((__sighandler_t) 4) /* pass as message (MINIX) */
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2005-04-21 16:53:53 +02:00
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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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2009-12-02 14:01:48 +01:00
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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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2005-04-21 16:53:53 +02:00
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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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2006-06-07 16:36:35 +02:00
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_PROTOTYPE( int killpg, (pid_t _pgrp, int _sig) );
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2005-04-21 16:53:53 +02:00
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_PROTOTYPE( int sigaction,
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(int _sig, const struct sigaction *_act, struct sigaction *_oact) );
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Merge of David's ptrace branch. Summary:
o Support for ptrace T_ATTACH/T_DETACH and T_SYSCALL
o PM signal handling logic should now work properly, even with debuggers
being present
o Asynchronous PM/VFS protocol, full IPC support for senda(), and
AMF_NOREPLY senda() flag
DETAILS
Process stop and delay call handling of PM:
o Added sys_runctl() kernel call with sys_stop() and sys_resume()
aliases, for PM to stop and resume a process
o Added exception for sending/syscall-traced processes to sys_runctl(),
and matching SIGKREADY pseudo-signal to PM
o Fixed PM signal logic to deal with requests from a process after
stopping it (so-called "delay calls"), using the SIGKREADY facility
o Fixed various PM panics due to race conditions with delay calls versus
VFS calls
o Removed special PRIO_STOP priority value
o Added SYS_LOCK RTS kernel flag, to stop an individual process from
running while modifying its process structure
Signal and debugger handling in PM:
o Fixed debugger signals being dropped if a second signal arrives when
the debugger has not retrieved the first one
o Fixed debugger signals being sent to the debugger more than once
o Fixed debugger signals unpausing process in VFS; removed PM_UNPAUSE_TR
protocol message
o Detached debugger signals from general signal logic and from being
blocked on VFS calls, meaning that even VFS can now be traced
o Fixed debugger being unable to receive more than one pending signal in
one process stop
o Fixed signal delivery being delayed needlessly when multiple signals
are pending
o Fixed wait test for tracer, which was returning for children that were
not waited for
o Removed second parallel pending call from PM to VFS for any process
o Fixed process becoming runnable between exec() and debugger trap
o Added support for notifying the debugger before the parent when a
debugged child exits
o Fixed debugger death causing child to remain stopped forever
o Fixed consistently incorrect use of _NSIG
Extensions to ptrace():
o Added T_ATTACH and T_DETACH ptrace request, to attach and detach a
debugger to and from a process
o Added T_SYSCALL ptrace request, to trace system calls
o Added T_SETOPT ptrace request, to set trace options
o Added TO_TRACEFORK trace option, to attach automatically to children
of a traced process
o Added TO_ALTEXEC trace option, to send SIGSTOP instead of SIGTRAP upon
a successful exec() of the tracee
o Extended T_GETUSER ptrace support to allow retrieving a process's priv
structure
o Removed T_STOP ptrace request again, as it does not help implementing
debuggers properly
o Added MINIX3-specific ptrace test (test42)
o Added proper manual page for ptrace(2)
Asynchronous PM/VFS interface:
o Fixed asynchronous messages not being checked when receive() is called
with an endpoint other than ANY
o Added AMF_NOREPLY senda() flag, preventing such messages from
satisfying the receive part of a sendrec()
o Added asynsend3() that takes optional flags; asynsend() is now a
#define passing in 0 as third parameter
o Made PM/VFS protocol asynchronous; reintroduced tell_fs()
o Made PM_BASE request/reply number range unique
o Hacked in a horrible temporary workaround into RS to deal with newly
revealed RS-PM-VFS race condition triangle until VFS is asynchronous
System signal handling:
o Fixed shutdown logic of device drivers; removed old SIGKSTOP signal
o Removed is-superuser check from PM's do_procstat() (aka getsigset())
o Added sigset macros to allow system processes to deal with the full
signal set, rather than just the POSIX subset
Miscellaneous PM fixes:
o Split do_getset into do_get and do_set, merging common code and making
structure clearer
o Fixed setpriority() being able to put to sleep processes using an
invalid parameter, or revive zombie processes
o Made find_proc() global; removed obsolete proc_from_pid()
o Cleanup here and there
Also included:
o Fixed false-positive boot order kernel warning
o Removed last traces of old NOTIFY_FROM code
THINGS OF POSSIBLE INTEREST
o It should now be possible to run PM at any priority, even lower than
user processes
o No assumptions are made about communication speed between PM and VFS,
although communication must be FIFO
o A debugger will now receive incoming debuggee signals at kill time
only; the process may not yet be fully stopped
o A first step has been made towards making the SYSTEM task preemptible
2009-09-30 11:57:22 +02:00
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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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2005-04-21 16:53:53 +02:00
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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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Merge of David's ptrace branch. Summary:
o Support for ptrace T_ATTACH/T_DETACH and T_SYSCALL
o PM signal handling logic should now work properly, even with debuggers
being present
o Asynchronous PM/VFS protocol, full IPC support for senda(), and
AMF_NOREPLY senda() flag
DETAILS
Process stop and delay call handling of PM:
o Added sys_runctl() kernel call with sys_stop() and sys_resume()
aliases, for PM to stop and resume a process
o Added exception for sending/syscall-traced processes to sys_runctl(),
and matching SIGKREADY pseudo-signal to PM
o Fixed PM signal logic to deal with requests from a process after
stopping it (so-called "delay calls"), using the SIGKREADY facility
o Fixed various PM panics due to race conditions with delay calls versus
VFS calls
o Removed special PRIO_STOP priority value
o Added SYS_LOCK RTS kernel flag, to stop an individual process from
running while modifying its process structure
Signal and debugger handling in PM:
o Fixed debugger signals being dropped if a second signal arrives when
the debugger has not retrieved the first one
o Fixed debugger signals being sent to the debugger more than once
o Fixed debugger signals unpausing process in VFS; removed PM_UNPAUSE_TR
protocol message
o Detached debugger signals from general signal logic and from being
blocked on VFS calls, meaning that even VFS can now be traced
o Fixed debugger being unable to receive more than one pending signal in
one process stop
o Fixed signal delivery being delayed needlessly when multiple signals
are pending
o Fixed wait test for tracer, which was returning for children that were
not waited for
o Removed second parallel pending call from PM to VFS for any process
o Fixed process becoming runnable between exec() and debugger trap
o Added support for notifying the debugger before the parent when a
debugged child exits
o Fixed debugger death causing child to remain stopped forever
o Fixed consistently incorrect use of _NSIG
Extensions to ptrace():
o Added T_ATTACH and T_DETACH ptrace request, to attach and detach a
debugger to and from a process
o Added T_SYSCALL ptrace request, to trace system calls
o Added T_SETOPT ptrace request, to set trace options
o Added TO_TRACEFORK trace option, to attach automatically to children
of a traced process
o Added TO_ALTEXEC trace option, to send SIGSTOP instead of SIGTRAP upon
a successful exec() of the tracee
o Extended T_GETUSER ptrace support to allow retrieving a process's priv
structure
o Removed T_STOP ptrace request again, as it does not help implementing
debuggers properly
o Added MINIX3-specific ptrace test (test42)
o Added proper manual page for ptrace(2)
Asynchronous PM/VFS interface:
o Fixed asynchronous messages not being checked when receive() is called
with an endpoint other than ANY
o Added AMF_NOREPLY senda() flag, preventing such messages from
satisfying the receive part of a sendrec()
o Added asynsend3() that takes optional flags; asynsend() is now a
#define passing in 0 as third parameter
o Made PM/VFS protocol asynchronous; reintroduced tell_fs()
o Made PM_BASE request/reply number range unique
o Hacked in a horrible temporary workaround into RS to deal with newly
revealed RS-PM-VFS race condition triangle until VFS is asynchronous
System signal handling:
o Fixed shutdown logic of device drivers; removed old SIGKSTOP signal
o Removed is-superuser check from PM's do_procstat() (aka getsigset())
o Added sigset macros to allow system processes to deal with the full
signal set, rather than just the POSIX subset
Miscellaneous PM fixes:
o Split do_getset into do_get and do_set, merging common code and making
structure clearer
o Fixed setpriority() being able to put to sleep processes using an
invalid parameter, or revive zombie processes
o Made find_proc() global; removed obsolete proc_from_pid()
o Cleanup here and there
Also included:
o Fixed false-positive boot order kernel warning
o Removed last traces of old NOTIFY_FROM code
THINGS OF POSSIBLE INTEREST
o It should now be possible to run PM at any priority, even lower than
user processes
o No assumptions are made about communication speed between PM and VFS,
although communication must be FIFO
o A debugger will now receive incoming debuggee signals at kill time
only; the process may not yet be fully stopped
o A first step has been made towards making the SYSTEM task preemptible
2009-09-30 11:57:22 +02:00
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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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2005-04-21 16:53:53 +02:00
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#endif
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#endif /* _SIGNAL_H */
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