getppid

GETPID(2)                    BSD System Calls Manual                   GETPID(2)

NAME
     getpid, getppid — get parent or calling process identification

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     pid_t
     getpid(void);

     pid_t
     getppid(void);

DESCRIPTION
     The getpid() system call returns the process ID of the calling process.
     Though the ID is guaranteed to be unique, it should NOT be used for
     constructing temporary file names, for security reasons; see mkstemp(3)
     instead.

     The getppid() system call returns the process ID of the parent of the
     calling process.

ERRORS
     The getpid() and getppid() system calls are always successful, and no
     return value is reserved to indicate an error.

SEE ALSO
     fork(2), getpgrp(2), kill(2), setpgid(2), setsid(2), exec(3)

STANDARDS
     The getpid() and getppid() system calls are expected to conform to ISO/IEC
     9945-1:1990 (“POSIX.1”).

HISTORY
     The getpid() function appeared in Version 7 AT&T UNIX.

BSD                             December 15, 2015                            BSD