119 lines
2.7 KiB
Groff
119 lines
2.7 KiB
Groff
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KILL(2) Minix Programmer's Manual KILL(2)
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NAME
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kill - send signal to a process
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SYNOPSIS
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#include <sys/types.h>
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#include <signal.h>
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int kill(pid_t pid, int sig)
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DESCRIPTION
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Kill sends the signal sig to a process, specified by the process number
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pid. Sig may be one of the signals specified in sigaction(2), or it may
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be 0, in which case error checking is performed but no signal is actually
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sent. This can be used to check the validity of pid.
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The sending and receiving processes must have the same effective user ID,
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otherwise this call is restricted to the super-user.
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If the process number is 0, the signal is sent to all processes in the
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sender's process group.
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If the process number is -1 and the user is the super-user, the signal is
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broadcast universally except to init and the process sending the signal.
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If the process number is -1 and the user is not the super-user, the
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signal is broadcast universally to all processes with the same uid as the
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user except the process sending the signal. No error is returned if any
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process could be signaled.
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If the process number is negative but not -1, the signal is sent to all
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processes whose process group ID is equal to the absolute value of the
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process number.
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Processes may send signals to themselves.
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RETURN VALUE
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Upon successful completion, a value of 0 is returned. Otherwise, a value
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of -1 is returned and errno is set to indicate the error.
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ERRORS
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Kill will fail and no signal will be sent if any of the following occur:
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[EINVAL] Sig is not a valid signal number.
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[ESRCH] No process can be found corresponding to that specified by
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pid.
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[ESRCH] The process id was given as 0 but the sending process does
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not have a process group.
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4BSD May 14, 1986 1
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KILL(2) Minix Programmer's Manual KILL(2)
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[EPERM] The sending process is not the super-user and its
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effective user id does not match the effective user-id of
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the receiving process. When signaling a process group,
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this error was returned if any members of the group could
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not be signaled.
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SEE ALSO
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getpid(2), getpgrp(2), sigaction(2), raise(3).
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4BSD May 14, 1986 2
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