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minix/include/signal.h
David van Moolenbroek b423d7b477 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 09:57:22 +00:00

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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 <sys/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 */
#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.
*/
#define SIGKMESS 29 /* new kernel message */
#define SIGKSIG 30 /* kernel signal pending */
#define SIGKREADY 31 /* ready for signal delivery */
#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 */
#define SIG_MESS ((__sighandler_t) 4) /* pass as message (MINIX) */
#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 */
#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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