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sends
the signal to the process group See for a list of signals. If is 0,
sends the signal to the sending process’s process group. The sending process
and members of the process group must have the same effective user ID,
or the sender must be the super-user. As a single special case the continue
signal SIGCONT may be sent to any process that is a descendant of the current
process.
Upon successful completion, a value of 0 is returned.
Otherwise, a value of -1 is returned and the global variable is set to
indicate the error.
will fail and no signal will be sent if: is
not a valid signal number. No process can be found in the process group
specified by The process group was given as 0 but the sending process
does not have a process group. The sending process is not the super-user
and one or more of the target processes has an effective user ID different
from that of the sending process.
The function call
appeared in
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