KILL (2)
send signal to a process
SYNOPSIS
#include <sys/types.h>
#include <signal.h>
int kill(pid_t pid , int sig );
DESCRIPTION
The
kill
system call
can be used to send any signal to any process group or process.
If pid is positive, then signal sig is sent to pid.
If pid equals 0, then sig is sent to every process in the
process group of the current process.
If pid equals -1, then sig is sent to every process except
for the first one, from higher numbers in the process table to lower.
If pid is less than -1, then sig is sent to every process
in the process group -pid.
If sig is 0, then no signal is sent, but error checking is still
performed.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and
errno
is set appropriately.
ERRORS
EINVAL
An invalid signal was specified.
ESRCH
The pid or process group does not exist.
Note that an existing process might be a zombie,
a process which already committed termination, but
has not yet been wait()ed for.
EPERM
The process does not have permission to send the signal
to any of the receiving processes.
For a process to have permission to send a signal to process
pid
it must either have root privileges, or the real or effective
user ID of the sending process must equal the real or
saved set-user-ID of the receiving process.
BUGS
It is impossible to send a signal to task number one, the init process, for
which it has not installed a signal handler. This is done to assure the
system is not brought down accidentally.
CONFORMING TO
SVr4, SVID, POSIX.1, X/OPEN, BSD 4.3
SEE ALSO
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