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    Command:

    getppid

    
    
    

    SYNOPSIS

           #include <sys/types.h>
           #include <unistd.h>
    
           pid_t getpid(void);
           pid_t getppid(void);
    
    
    

    DESCRIPTION

           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.
    
    
    

    ERRORS

           These functions are always successful.
    
    
    

    CONFORMING TO

           POSIX.1-2001, 4.3BSD, SVr4.
    
    
    

    NOTES

           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.
    
    
    

    SEE ALSO

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

    Linux 2008-09-23 GETPID(2)

    
    
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