Obtaining A Process ID (PID)

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getpid

getpid(2)							System Calls Manual							 getpid(2)

NAME

       getpid(), getpgid(), getpgrp(), getpgrp2(), getppid() - get process, process group and parent process ID.

SYNOPSIS

DESCRIPTION

       These functions return process, process group and parent process IDs, as follows:

	      Process group ID of the specified process.
				  If pid is zero, the call applies to the calling process.  Same result as

	      Process group ID of the calling process.

	      Process group ID of the specified process.
				  If pid is zero, the call applies to the calling process.  Same result as

	      Process ID of the calling process.

	      Parent process ID of the calling process.
				  If the parent process is the initialization process (known as the call returns 1.

   Security Restrictions
       The  system  call is subject to compartmental restrictions.  See compartments(5) for more information about compartmentalization on systems
       that support that feature.

       Compartmental restrictions can be overridden if the process possesses the privilege (PRIV_COMMALLOWED).	Processes owned by  the  superuser
       may  not  have  this privilege.	Processes owned by any user may have this privilege, depending on system configuration.  See privileges(5)
       for more information about privileged access on systems that support fine-grained privileges.

RETURN VALUE

       The functions return the following values:

	      Successful completion.
		     n is a nonnegative process ID, as described above.
	      Failure:
		     and only.	is set to indicate the error.

ERRORS

       If or fails, is set to one of the following values:

	      [EPERM]	     The current process and pid are not in the same session (see setsid(2)).

	      [ESRCH]	     No process can be found corresponding to that specified by pid.

AUTHOR

       and were developed by HP, AT&T, and the University of California, Berkeley.

SEE ALSO

       exec(2), fork(2), setpgid(2), setsid(2), signal(5).

STANDARDS CONFORMANCE

																	 getpid(2)

UNIX for Advanced & Expert Users