kill man page on Ultrix

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kill(2)								       kill(2)

       kill - send signal to a process

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

       kill(pid, sig)
       pid_t pid;
       int sig;

       The  system  call  sends	 the  signal sig to a process specified by the
       process number pid.  The sig can be a signal specified in a call or  it
       can  be	0.  If the sig is 0, error checking is performed, but a signal
       is not sent.  This call 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 superuser with the excep‐
       tion of the signal SIGCONT.  The signal SIGCONT can always be sent to a
       child or grandchild of the current process.

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

       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.

       The above two options are variants of

       If the process number is -1, and the user is the superuser, the	signal
       is  broadcast  for  all	processes  except  to system processes and the
       process sending the signal.

       Processes may send signals to themselves.

       System Five

       When your program is compiled in the System V or POSIX  environment,  a
       signal  is  sent	 if  either  the  real or effective uid of the sending
       process matches the real or saved-set-uid (as described	in  )  of  the
       receiving  process.  In	addition, any process can use a pid of -1, and
       the signal is sent to all processes subject to these permission checks.

       In POSIX mode, the pid argument is of type pid_t.

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

       The system call fails under the following conditions:

       [EINVAL]	      The sig is not a valid signal number.

       [EPERM]	      The sending process is not the superuser, and its effec‐
		      tive user ID does not match the effective user ID of the
		      receiving process.

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

See Also
       execve(2), getpgrp(2), getpid(2), killpg(2), sigvec(2), pause(3)


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