IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group A newer edition of this document exists here
NAME
getpid - get the process ID
SYNOPSIS
#include <unistd.h>pid_t getpid(void);
DESCRIPTION
The getpid() function shall return the process ID of the calling process.
RETURN VALUE
The getpid() function shall always be successful and no return value is reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
exec, fork, getpgrp, getppid, kill, mkdtemp, setpgid, setsid
XBD <sys/types.h>, <unistd.h>
CHANGE HISTORY
First released in Issue 1. Derived from Issue 1 of the SVID.
Issue 6
In the SYNOPSIS, the optional include of the <sys/types.h> header is removed.
The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:
The requirement to include <sys/types.h> has been removed. Although <sys/types.h> was required for conforming implementations of previous POSIX specifications, it was not required for UNIX applications.
End of informative text.
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