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83 lines
2.9 KiB
Groff
83 lines
2.9 KiB
Groff
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93
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.\"
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.TH GETPID 2 "16 January 1997" GNO "System Calls"
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.SH NAME
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.BR getpid ,
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.BR getppid
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\- get parent or calling process identification
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.SH SYNOPSIS
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.br
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#include <unistd.h>
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.sp 1
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pid_t
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.BR getpid (void);
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.br
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pid_t
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.BR getppid (void);
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.SH DESCRIPTION
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.BR Getpid
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returns
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the process ID of
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the calling process.
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The ID is guaranteed to be unique and is
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useful for constructing temporary file names.
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.LP
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Pids can range from zero (Kernel Null Process) to 32767. Some programs use
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.BR getpid
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to seed random number generators. A much better approach on the IIgs is
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to use the horizontal and vertical positions fo the electron gun, which
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can be obtained by reading the word value at absolute address 0xE0C02E.
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.LP
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.BR Getppid
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returns the process ID of the parent
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of the calling process.
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.SH ERRORS
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The
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.BR getpid
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and
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.BR getppid
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functions are always successful; no return value is reserved to
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indicate an error.
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.SH SEE ALSO
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.BR fork (2),
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.BR tctpgrp (2),
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.BR ioctl (2),
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.BR gethostid (3),
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.IR "GNO Kernel Reference Manual" .
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.SH STANDARDS
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.BR Getpid
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and
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.BR getppid
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conform to IEEE Std 1003.1-1988 (POSIX).
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