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getpid (2)
  • getpid (2) ( Solaris man: Системные вызовы )
  • getpid (2) ( FreeBSD man: Системные вызовы )
  • getpid (2) ( Русские man: Системные вызовы )
  • >> getpid (2) ( Linux man: Системные вызовы )
  • getpid (3) ( Solaris man: Библиотечные вызовы )
  • getpid (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    getpid, getppid - get process identification
     
    

    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 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

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    ERRORS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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