getpid - get process id
integer function getpid()
Getpid returns the process ID number of the current process.
SEE ALSO getpid(2)4.2 Berkeley Distribution May 15, 1985 GETPID(3F)
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GETPID(2) Linux Programmer's Manual GETPID(2)NAME
getpid, getppid - get process identification
getpid() returns the process ID of the calling process. (This is often used by routines that generate unique temporary filenames.)
getppid() returns the process ID of the parent of the calling process.
These functions are always successful.
POSIX.1-2001, 4.3BSD, SVr4.
Since glibc version 2.3.4, the glibc wrapper function for getpid() caches PIDs, so as to avoid additional system calls when a process calls
getpid() repeatedly. Normally this caching is invisible, but its correct operation relies on support in the wrapper functions for fork(2),
vfork(2), and clone(2): if an application bypasses the glibc wrappers for these system calls by using syscall(2), then a call to getpid()
in the child will return the wrong value (to be precise: it will return the PID of the parent process). See also clone(2) for discussion
of a case where getpid() may return the wrong value even when invoking clone(2) via the glibc wrapper function.
SEE ALSO clone(2), fork(2), kill(2), exec(3), mkstemp(3), tempnam(3), tmpfile(3), tmpnam(3), credentials(7)COLOPHON
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Linux 2008-09-23 GETPID(2)