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getpid(2)
NAME
  getpid, getpgrp, getppid - Gets the process ID, process group ID, parent
  process ID

SYNOPSIS
  #include <unistd.h>

  pid_t getpid( void );

  pid_t getpgrp( void );

  pid_t getppid( void );

  Application developers may want to specify an #include statement for
  <sys/types.h> before the one for <unistd.h> if programs are being developed
  for multiple platforms. The additional #include statement is not required
  on Tru64 UNIX systems or by ISO or X/Open standards, but may be required on
  other vendors' systems that conform to these standards.

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  getpid(), getpgrp(), getppid():  POSIX.1, XPG4, XPG4-UNIX

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

DESCRIPTION
  The getpid() function returns the process ID of the calling process.

  The getpgrp() function returns the process group ID of the calling process.

  The getppid() function returns the parent process ID of the calling
  process.  When a process is created, its parent process ID is the process
  ID of its parent process.  If a parent process exits, the parent process
  IDs of its child processes are changed to the process ID of the init
  program.

RELATED INFORMATION
  System calls: fork(2), kill(2), setpgid(2), setsid(2), wait(2)

  Standards: standards(5)

Index for Section 2

Alphabetical listing for G

Top of page