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KILL(2) UNIX Programmer's Manual KILL(2)
NNAAMMEE
kkiillll - send signal to a process
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ssiiggnnaall..hh>>
_i_n_t
kkiillll(_p_i_d___t _p_i_d, _i_n_t _s_i_g)
DDEESSCCRRIIPPTTIIOONN
The kkiillll() function sends the signal given by _s_i_g to _p_i_d, a process or a
group of processes. _S_i_g may be one of the signals specified in sigac
tion(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 _p_i_d.
For a process to have permission to send a signal to a process designated
by _p_i_d, the real or effective user ID of the receving process must match
that of the sending process or the user must have appropriate privileges
(such as given by a setuserID program or the user is the superuser).
A single exception is the signal SIGCONT, which may always be sent to any
descendant of the current process.
If _p_i_d is greater than zero:
_S_i_g is sent to the process whose ID is equal to _p_i_d_.
If _p_i_d is zero:
_S_i_g is sent to all processes whose group ID is equal to the pro
cess group ID of the sender, and for which the process has per
mission; this is a variant of killpg(2).
If _p_i_d is 1:
If the user has super user privileges, the signal is sent to all
processes excluding system processes. If the user is not the su
per user, the signal is sent 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.
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(2).
RREETTUURRNN VVAALLUUEESS
Upon successful completion, a value of 0 is returned. Otherwise, a value
of 1 is returned and _e_r_r_n_o is set to indicate the error.
EERRRROORRSS
KKiillll() will fail and no signal will be sent if:
[EINVAL] _S_i_g is not a valid signal number.
[ESRCH] No process can be found corresponding to that specified by _p_i_d.
[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 superuser and its effective us
er id does not match the effective userid of the receiving
process. When signaling a process group, this error is re
turned if any members of the group could not be signaled.
SSEEEE AALLSSOO
getpid(2), getpgrp(2), killpg(2), sigaction(2)
SSTTAANNDDAARRDDSS
The kkiillll() function is expected to conform to IEEE Std 1003.11988
(``POSIX'').
4th Berkeley Distribution March 10, 1991 2