kill(2) [minix man page]

KILL(2) 							System Calls Manual							   KILL(2)

NAME

       kill - send signal to a process

SYNOPSIS

       #include <sys/types.h>
       #include <signal.h>

       int kill(pid_t pid, int sig)

DESCRIPTION

       Kill  sends  the signal sig to a process, specified by the process number pid.  Sig may be one of the signals specified in sigaction(2), or
       it may be 0, in which case error checking is performed but no signal is actually sent.  This can be used to check the validity of pid.

       The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user.

       If the process number is 0, the signal is sent to all processes in the sender's process group.

       If the process number is -1 and the user is the super-user, the signal is broadcast universally except to init and the process sending  the
       signal.	If the process number is -1 and the user is not the super-user, the signal is broadcast universally to all processes with the same
       uid as the user except the process sending the signal.  No error is returned if any process could be signaled.

       If the process number is negative but not -1, the signal is sent to all processes whose process group ID is equal to the absolute value	of
       the process number.

       Processes may send signals to themselves.

RETURN VALUE

       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       Kill will fail and no signal will be sent if any of the following occur:

       [EINVAL]       Sig is not a valid signal number.

       [ESRCH]	      No process can be found corresponding to that specified by pid.

       [ESRCH]	      The process id was given as 0 but the sending process does not have a process group.

       [EPERM]	      The  sending  process  is not the super-user and its effective user id does not match the effective user-id of the receiving
		      process.	When signaling a process group, this error was returned if any members of the group could not be signaled.

SEE ALSO

       getpid(2), getpgrp(2), sigaction(2), raise(3).

4th Berkeley Distribution					   May 14, 1986 							   KILL(2)

KILL(2) 						      BSD System Calls Manual							   KILL(2)

NAME

     kill -- send signal to a process

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <signal.h>

     int
     kill(pid_t pid, int sig);

DESCRIPTION

     The kill() function sends the signal given by sig to pid, a process or a group of processes.  sig may be one of the signals specified in
     sigaction(2) or it may be 0, in which case error checking is performed but no signal is actually sent.  This can be used to check the valid-
     ity of pid.

     For a process to have permission to send a signal to a process designated by pid, the real or effective user ID of the receiving process must
     match that of the sending process or the user must have appropriate privileges (such as given by a set-user-ID program or the user is the
     super-user).  A single exception is the signal SIGCONT, which may always be sent to any descendant of the current process.

     If pid is greater than zero:
	     sig is sent to the process whose ID is equal to pid.

     If pid is zero:
	     sig is sent to all processes whose process group ID is equal to the process group ID of the sender, and for which the process has
	     permission; this is a variant of killpg(3).

     If pid is -1:
	     If the user has super-user privileges, the signal is sent to all processes excluding system processes and the process sending the
	     signal.  If the user is not the super user, the signal is sent to all processes with the same uid as the user excluding the process
	     sending the signal.  No error is returned if any process could be signaled.

     For compatibility with System V, if the process number is negative but not -1, the signal is sent to all processes whose process group ID is
     equal to the absolute value of the process number.  This is a variant of killpg(3).

RETURN VALUES

     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

     kill() will fail and no signal will be sent if:

     [EINVAL]		sig is not a valid signal number.

     [ESRCH]		No process can be found corresponding to that specified by pid.

     [ESRCH]		The process id was given as 0 but the sending process does not have a process group.

     [EPERM]		The sending process is not the super-user and its effective user id does not match the effective user-id of the receiving
			process.  When signaling a process group, this error is returned if any members of the group could not be signaled.

SEE ALSO

     getpgrp(2), getpid(2), sigaction(2), killpg(3), signal(7)

STANDARDS

     The kill() function is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').

BSD
								  April 19, 1994							       BSD