GETPID(2) | 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

`getpid`() returns the process ID of the calling process. The ID is guaranteed to be unique and is useful for constructing temporary file names.

`getppid`() returns the process ID of the parent of the calling process.

# ERRORS

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

# SEE ALSO

gethostid(3)

# STANDARDS

`getpid`() and `getppid`() conform to IEEE Std 1003.1-1990 (“POSIX.1”).

# HISTORY

The `getpid`() function appeared in Version 5 AT&T UNIX.

April 3, 2010 | NetBSD 9.2