getpid(2) - phpMan

Command: man perldoc info search(apropos)  

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.  Nor-
       mally 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  get-
       pid()  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  get-
       pid()  may return the wrong value even when invoking clone(2) via the glibc wrapper

       clone(2), fork(2), kill(2), exec(3), mkstemp(3), tempnam(3), tmpfile(3), tmpnam(3),

       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-

Linux                             2008-09-23                         GETPID(2)

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2018-01-24 05:47 @ CrawledBy CCBot/2.0 (
Valid XHTML 1.0!Valid CSS!