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-.\"     @(#)sigvec.2	8.2 (Berkeley) 4/19/94
-.\" $FreeBSD: src/lib/libc/compat-43/sigvec.2,v 1.9.2.7 2001/12/14 18:33:49 ru Exp $
-.\"
-.Dd April 19, 1994
-.Dt SIGVEC 2
-.Os
-.Sh NAME
-.Nm sigvec
-.Nd software signal facilities
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In signal.h
-.Bd -literal
-struct sigvec {
-        void     (*sv_handler)();
-	int      sv_mask;
-	int      sv_flags;
-};
-.Ed
-.Ft int
-.Fn sigvec "int sig" "struct sigvec *vec" "struct sigvec *ovec"
-.Sh DESCRIPTION
-.Bf -symbolic
-This interface is made obsolete by
-.Xr sigaction 2 .
-.Ef
-.Pp
-The system defines a set of signals that may be delivered to a process.
-Signal delivery resembles the occurrence of a hardware interrupt:
-the signal is blocked from further occurrence, the current process
-context is saved, and a new one is built.  A process may specify a
-.Em handler
-to which a signal is delivered, or specify that a signal is to be
-.Em blocked
-or
-.Em ignored .
-A process may also specify that a default action is to be taken
-by the system when a signal occurs.
-Normally, signal handlers execute on the current stack
-of the process.  This may be changed, on a per-handler basis,
-so that signals are taken on a special
-.Em "signal stack" .
-.Pp
-All signals have the same
-.Em priority .
-Signal routines execute with the signal that caused their
-invocation
-.Em blocked ,
-but other signals may yet occur.
-A global
-.Em "signal mask"
-defines the set of signals currently blocked from delivery
-to a process.  The signal mask for a process is initialized
-from that of its parent (normally 0).  It
-may be changed with a
-.Xr sigblock 2
-or
-.Xr sigsetmask 2
-call, or when a signal is delivered to the process.
-.Pp
-When a signal
-condition arises for a process, the signal is added to a set of
-signals pending for the process.  If the signal is not currently
-.Em blocked
-by the process then it is delivered to the process.  When a signal
-is delivered, the current state of the process is saved,
-a new signal mask is calculated (as described below),
-and the signal handler is invoked.  The call to the handler
-is arranged so that if the signal handling routine returns
-normally the process will resume execution in the context
-from before the signal's delivery.
-If the process wishes to resume in a different context, then it
-must arrange to restore the previous context itself.
-.Pp
-When a signal is delivered to a process a new signal mask is
-installed for the duration of the process' signal handler
-(or until a
-.Xr sigblock 2
-or
-.Xr sigsetmask 2
-call is made).
-This mask is formed by taking the current signal mask,
-adding the signal to be delivered, and
-.Em or Ns 'ing
-in the signal mask associated with the handler to be invoked.
-.Pp
-.Fn Sigvec
-assigns a handler for a specific signal.  If
-.Fa vec
-is non-zero, it
-specifies a handler routine and mask
-to be used when delivering the specified signal.
-Further, if the
-.Dv SV_ONSTACK
-bit is set in
-.Fa sv_flags ,
-the system will deliver the signal to the process on a
-.Em "signal stack" ,
-specified with
-.Xr sigaltstack 2 .
-If
-.Fa ovec
-is non-zero, the previous handling information for the signal
-is returned to the user.
-.Pp
-The following is a list of all signals
-with names as in the include file
-.Aq Pa signal.h :
-.Bl -column SIGVTALARMXX "create core imagexxx"
-.It Sy "NAME	Default Action	Description"
-.It Dv SIGHUP No "	terminate process" "	terminal line hangup"
-.It Dv SIGINT No "	terminate process" "	interrupt program"
-.It Dv SIGQUIT No "	create core image" "	quit program"
-.It Dv SIGILL No "	create core image" "	illegal instruction"
-.It Dv SIGTRAP No "	create core image" "	trace trap"
-.It Dv SIGABRT No "	create core image" Ta Xr abort 3
-call (formerly
-.Dv SIGIOT )
-.It Dv SIGEMT No "	create core image" "	emulate instruction executed"
-.It Dv SIGFPE No "	create core image" "	floating-point exception"
-.It Dv SIGKILL No "	terminate process" "	kill program"
-.It Dv SIGBUS No "	create core image" "	bus error"
-.It Dv SIGSEGV No "	create core image" "	segmentation violation"
-.It Dv SIGSYS No "	create core image" "	non-existent system call invoked"
-.It Dv SIGPIPE No "	terminate process" "	write on a pipe with no reader"
-.It Dv SIGALRM No "	terminate process" "	real-time timer expired"
-.It Dv SIGTERM No "	terminate process" "	software termination signal"
-.It Dv SIGURG No "	discard signal" "	urgent condition present on socket"
-.It Dv SIGSTOP No "	stop process" "	stop (cannot be caught or ignored)"
-.It Dv SIGTSTP No "	stop process" "	stop signal generated from keyboard"
-.It Dv SIGCONT No "	discard signal" "	continue after stop"
-.It Dv SIGCHLD No "	discard signal" "	child status has changed"
-.It Dv SIGTTIN No "	stop process" "	background read attempted from control terminal"
-.It Dv SIGTTOU No "	stop process" "	background write attempted to control terminal"
-.It Dv SIGIO No "	discard signal" Tn "	I/O"
-is possible on a descriptor (see
-.Xr fcntl 2 )
-.It Dv SIGXCPU No "	terminate process" "	cpu time limit exceeded (see"
-.Xr setrlimit 2 )
-.It Dv SIGXFSZ No "	terminate process" "	file size limit exceeded (see"
-.Xr setrlimit 2 )
-.It Dv SIGVTALRM No "	terminate process" "	virtual time alarm (see"
-.Xr setitimer 2 )
-.It Dv SIGPROF No "	terminate process" "	profiling timer alarm (see"
-.Xr setitimer 2 )
-.It Dv SIGWINCH No "	discard signal" "	Window size change"
-.It Dv SIGINFO No "	discard signal" "	status request from keyboard"
-.It Dv SIGUSR1 No "	terminate process" "	User defined signal 1"
-.It Dv SIGUSR2 No "	terminate process" "	User defined signal 2"
-.El
-.Pp
-Once a signal handler is installed, it remains installed
-until another
-.Fn sigvec
-call is made, or an
-.Xr execve 2
-is performed.
-A signal-specific default action may be reset by
-setting
-.Fa sv_handler
-to
-.Dv SIG_DFL .
-The defaults are process termination, possibly with core dump;
-no action; stopping the process; or continuing the process.
-See the above signal list for each signal's default action.
-If
-.Fa sv_handler
-is
-.Dv SIG_IGN
-current and pending instances
-of the signal are ignored and discarded.
-.Pp
-If a signal is caught during the system calls listed below,
-the call is normally restarted.
-The call can be forced to terminate prematurely with an
-.Er EINTR
-error return by setting the
-.Dv SV_INTERRUPT
-bit in
-.Fa sv_flags .
-The affected system calls include
-.Xr read 2 ,
-.Xr write 2 ,
-.Xr sendto 2 ,
-.Xr recvfrom 2 ,
-.Xr sendmsg 2
-and
-.Xr recvmsg 2
-on a communications channel or a slow device (such as a terminal,
-but not a regular file)
-and during a
-.Xr wait 2
-or
-.Xr ioctl 2 .
-However, calls that have already committed are not restarted,
-but instead return a partial success (for example, a short read count).
-.Pp
-After a
-.Xr fork 2
-or
-.Xr vfork 2
-all signals, the signal mask, the signal stack,
-and the restart/interrupt flags are inherited by the child.
-.Pp
-.Xr Execve 2
-reinstates the default
-action for all signals which were caught and
-resets all signals to be caught on the user stack.
-Ignored signals remain ignored;
-the signal mask remains the same;
-signals that interrupt system calls continue to do so.
-.Sh NOTES
-The mask specified in
-.Fa vec
-is not allowed to block
-.Dv SIGKILL
-or
-.Dv SIGSTOP .
-This is done silently by the system.
-.Pp
-The
-.Dv SV_INTERRUPT
-flag is not available in
-.Bx 4.2 ,
-hence it should not be used if backward compatibility is needed.
-.Sh RETURN VALUES
-.Rv -std sigvec
-.Sh ERRORS
-.Fn Sigvec
-will fail and no new signal handler will be installed if one
-of the following occurs:
-.Bl -tag -width Er
-.It Bq Er EFAULT
-Either
-.Fa vec
-or
-.Fa ovec
-points to memory that is not a valid part of the process
-address space.
-.It Bq Er EINVAL
-.Fa Sig
-is not a valid signal number.
-.It Bq Er EINVAL
-An attempt is made to ignore or supply a handler for
-.Dv SIGKILL
-or
-.Dv SIGSTOP .
-.El
-.Sh SEE ALSO
-.Xr kill 1 ,
-.Xr kill 2 ,
-.Xr ptrace 2 ,
-.Xr sigaction 2 ,
-.Xr sigaltstack 2 ,
-.Xr sigblock 2 ,
-.Xr sigpause 2 ,
-.Xr sigprocmask 2 ,
-.Xr sigsetmask 2 ,
-.Xr sigsuspend 2 ,
-.Xr setjmp 3 ,
-.Xr siginterrupt 3 ,
-.Xr signal 3 ,
-.Xr sigsetops 3 ,
-.Xr tty 4
-.Sh EXAMPLES
-On the
-.Tn VAX\-11
-The handler routine can be declared:
-.Bd -literal -offset indent
-void handler(sig, code, scp)
-int sig, code;
-struct sigcontext *scp;
-.Ed
-.Pp
-Here
-.Fa sig
-is the signal number, into which the hardware faults and traps are
-mapped as defined below.
-.Fa Code
-is a parameter that is either a constant
-as given below or, for compatibility mode faults, the code provided by
-the hardware (Compatibility mode faults are distinguished from the
-other
-.Dv SIGILL
-traps by having
-.Dv PSL_CM
-set in the psl).
-.Fa Scp
-is a pointer to the
-.Fa sigcontext
-structure (defined in
-.Aq Pa signal.h ) ,
-used to restore the context from before the signal.
-.Sh BUGS
-This manual page is still confusing.