KILL.2
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- KILL(2) Minix Programmer's 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.
- 4BSD May 14, 1986 1
- KILL(2) Minix Programmer's Manual KILL(2)
- [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).
- 4BSD May 14, 1986 2