124 lines
3.1 KiB
HTML
124 lines
3.1 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>kill(2)</TITLE>
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</HEAD>
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<BODY>
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<H1>kill(2)</H1>
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<HR>
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<PRE>
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</PRE>
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<H2>NAME</H2><PRE>
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kill - send signal to a process
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>#include</STRONG> <STRONG><sys/types.h></STRONG>
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<STRONG>#include</STRONG> <STRONG><signal.h></STRONG>
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<STRONG>int</STRONG> <STRONG>kill(pid_t</STRONG> <EM>pid</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>sig</EM><STRONG>)</STRONG>
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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<STRONG>Kill</STRONG> sends the signal <EM>sig</EM> to a process, specified by the process number
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<EM>pid</EM>. <EM>Sig</EM> may be one of the signals specified in <STRONG><A HREF="../man2/sigaction.2.html">sigaction(2)</A></STRONG>, 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 <EM>pid</EM>.
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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 <STRONG>init</STRONG> 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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</PRE>
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<H2>RETURN VALUE</H2><PRE>
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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 <STRONG>errno</STRONG> is set to indicate the error.
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</PRE>
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<H2>ERRORS</H2><PRE>
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<STRONG>Kill</STRONG> will fail and no signal will be sent if any of the following occur:
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[EINVAL] <EM>Sig</EM> 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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<EM>pid</EM>.
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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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[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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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="../man2/getpid.2.html">getpid(2)</A></STRONG>, <STRONG><A HREF="../man2/getpgrp.2.html">getpgrp(2)</A></STRONG>, <STRONG><A HREF="../man2/sigaction.2.html">sigaction(2)</A></STRONG>, <STRONG><A HREF="../man3/raise.3.html">raise(3)</A></STRONG>.
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</PRE>
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</BODY>
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</HTML>
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