sigsend(2)							System Calls Manual							sigsend(2)

NAME

       sigsend(), sigsendset() - send a signal to a process or a group of processes

SYNOPSIS

DESCRIPTION

       The  system  call sends a signal to a process or a group of processes.  The process or group of processes to which the signal is to be sent
       is specified by id and idtype.  The signal to be sent is specified by sig and is either one from the list given in (see signal(2)) or 0.

       If sig is equal to zero (the null signal), error checking is performed but no signal is actually sent.  This  can  be  used  to	check  the
       validity of id and idtype.

       The  real or effective user ID of the sending process must match the real or effective user ID of the receiving process, unless the process
       has appropriate privileges, or sig is and the sending process has the same session ID as the receiving process.

       idtype and id work together as follows:

	      o  If idtype is sig will be sent to the process with a process ID equal to

	      o  If idtype is sig will be sent to any process with a process group ID equal to

	      o  If idtype is sig will be sent to any process with a session ID equal to

	      o  If idtype is sig will be sent to any process with an effective user ID equal to

	      o  If idtype is sig will be sent to any process with an effective group ID equal to

	      o  If idtype is sig will be sent to all processes and id will be ignored.

	      o  If id is the value of id is taken from the calling process.

       The process with a process ID of is always excluded.  The process with a process ID of is included only if idtype is equal to

       provides an alternate interface for sending signals to a set of processes.

       psp is a pointer to a structure that includes the following members:

	      idop	 p_op;
	      idtype_t	 p_lidtype;
	      id_t	 p_lid;
	      idtype_t	 p_ridtype;
	      id_t	 p_rid;

       The structure defines a set of processes as the result of a set operation (difference, union, intersection, or exclusion) on  two  operands
       (idtype/id  pairs).  The left (right) operand is specified by and takes the values specified by id and takes the values specified by idtype
       in the system call defined above.  p_op specifies the operand, and takes one of the following values:

	      Set difference.
			     The resultant set consists of the processes that are in the left operand and not in the right operand.

	      Set intersection.
			     The resultant set consists of the processes that are in both the left and right operands.

	      Set union.     The resultant set consists of the processes that are in either the left or right operand or both.

	      Set exclusive  The resultant set consists of the processes that are in either the left or right operand but not in both.

RETURN VALUE

       Upon successful completion, returns a value of Otherwise, it returns a value of -1 and sets to indicate the error.

ERRORS

       If fails, it sets errno (see errno(2)) to one of the following values:

	      [EINVAL]	     sig is neither a valid signal number nor zero.

	      [EINVAL]	     idtype is not a valid value.

	      [EINVAL]	     sig is idtype is and id is

	      [ESRCH]	     No process can be found corresponding to that specified by id and idtype.

	      [EPERM]	     The user ID of the sending process is not 0, and its real or effective user ID does not match the real  or  effective
			     user  ID  of  the receiving process, and the calling process is not sending to a process that shares the same session
			     ID.

SEE ALSO

       kill(2), signal(2).

																	sigsend(2)