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Cisco Internetwork Operating System (IOS) is a family of network operating systems used on many Cisco Systems routers and current Cisco network switches originally designed by Sun Microsystems.
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getpid(2) [bsd man page]

GETPID(2)							System Calls Manual							 GETPID(2)

getpid, getppid - get process identification SYNOPSIS
pid = getpid() int pid; ppid = getppid() int ppid; DESCRIPTION
Getpid returns the process ID of the current process. Most often it is used to generate uniquely-named temporary files. Getppid returns the process ID of the parent of the current process. SEE ALSO
gethostid(2) 4th Berkeley Distribution May 13, 1986 GETPID(2)

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

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 3.27 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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