pcntl_getpriority(3) [php man page]

PCNTL_GETPRIORITY(3)							 1						      PCNTL_GETPRIORITY(3)

pcntl_getpriority - Get the priority of any process

SYNOPSIS

       int pcntl_getpriority ([int  $pid = getmypid()], [int  $process_identifier = PRIO_PROCESS])

DESCRIPTION

       pcntl_getpriority(3)  gets  the	priority  of $pid. Because priority levels can differ between system types and kernel versions, please see
       your system's getpriority(2) man page for specific details.

PARAMETERS

	      o $pid
		- If not specified, the pid of the current process is used.

	      o $process_identifier
		- One of PRIO_PGRP, PRIO_USER or PRIO_PROCESS.

RETURN VALUES

       pcntl_getpriority(3) returns the priority of the process or FALSE on error. A lower numerical value causes more favorable scheduling.

       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

SEE ALSO

       pcntl_setpriority(3).

PHP Documentation Group 												      PCNTL_GETPRIORITY(3)

GETPRIORITY(2)						      BSD System Calls Manual						    GETPRIORITY(2)

NAME

     getpriority, setpriority -- get/set program scheduling priority

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/resource.h>

     int
     getpriority(int which, id_t who);

     int
     setpriority(int which, id_t who, int prio);

DESCRIPTION

     The scheduling priority of the process, process group, or user, as indicated by which and who is obtained with the getpriority() call and set
     with the setpriority() call.  which is one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, and who is interpreted relative to which (a process
     identifier for PRIO_PROCESS, process group identifier for PRIO_PGRP, and a user ID for PRIO_USER).  A zero value of who denotes the current
     process, process group, or user.  prio is a value in the range -20 to 20.	The default priority is 0; lower priorities cause more favorable
     scheduling.  A value of 19 or 20 will schedule a process only when nothing at priority <= 0 is runnable.

     The getpriority() call returns the highest priority (lowest numerical value) enjoyed by any of the specified processes.  The setpriority()
     call sets the priorities of all of the specified processes to the specified value.  Only the super-user may lower priorities.

RETURN VALUES

     Since getpriority() can legitimately return the value -1, it is necessary to clear the external variable errno prior to the call, then check
     it afterward to determine if a -1 is an error or a legitimate value.  The setpriority() call returns 0 if there is no error, or -1 if there
     is.

ERRORS

     getpriority() and setpriority() will fail if:

     [ESRCH]		No process was located using the which and who values specified.

     [EINVAL]		which was not one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER.

     In addition to the errors indicated above, setpriority() will fail if:

     [EPERM]		A process was located, but neither its effective nor real user ID matched the effective user ID of the caller.

     [EACCES]		A non super-user attempted to lower a process priority.

SEE ALSO

     nice(1), fork(2), renice(8)

HISTORY

     The getpriority() function call appeared in 4.2BSD.

BSD
								  April 25, 2004							       BSD