getpid man page on Archlinux

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GETPID(2)		   Linux Programmer's Manual		     GETPID(2)

       getpid, getppid - get process identification

       #include <sys/types.h>
       #include <unistd.h>

       pid_t getpid(void);
       pid_t getppid(void);

       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 dis‐
       cussion of a case where getpid() may return the wrong value  even  when
       invoking clone(2) via the glibc wrapper function.

       clone(2),  fork(2),  kill(2),  exec(3),	mkstemp(3),  tempnam(3),  tmp‐
       file(3), tmpnam(3), credentials(7)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2008-09-23			     GETPID(2)

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