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Annotation of cci/usr/src/man/man2/getpriority.2, revision 1.1

1.1     ! root        1: .TH GETPRIORITY 2 "18 July 1983"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: getpriority, setpriority \- get/set program scheduling priority
        !             5: .SH SYNOPSIS
        !             6: .nf
        !             7: .ft B
        !             8: #include <sys/resource.h>
        !             9: .PP
        !            10: .ft B
        !            11: #define PRIO_PROCESS   0       /* process */
        !            12: #define PRIO_PGRP              1       /* process group */
        !            13: #define PRIO_USER              2       /* user id */
        !            14: .PP
        !            15: .ft B
        !            16: prio = getpriority(which, who)
        !            17: int prio, which, who;
        !            18: .PP
        !            19: .ft B
        !            20: setpriority(which, who, prio)
        !            21: int which, who, prio;
        !            22: .fi
        !            23: .SH DESCRIPTION
        !            24: The scheduling
        !            25: priority of the process, process group, or user, as indicated by
        !            26: .I which
        !            27: and
        !            28: .I who
        !            29: is obtained with the
        !            30: .I getpriority
        !            31: call and set with the
        !            32: .I setpriority
        !            33: call.
        !            34: .I Which
        !            35: is one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, and 
        !            36: .I who
        !            37: is interpreted relative to 
        !            38: .I which
        !            39: (a process identifier for PRIO_PROCESS, process group
        !            40: identifier for PRIO_PGRP, and a user ID for PRIO_USER).
        !            41: .I Prio
        !            42: is a value in the range \-20 to 20.  The default priority is 0;
        !            43: lower priorities cause more favorable scheduling.
        !            44: .PP
        !            45: The
        !            46: .I getpriority
        !            47: call returns the highest priority (lowest numerical value)
        !            48: enjoyed by any of the specified processes.  The
        !            49: .I setpriority
        !            50: call sets the priorities of all of the specified processes
        !            51: to the specified value.  Only the super-user may lower priorities.
        !            52: .SH "RETURN VALUE
        !            53: Since
        !            54: .I getpriority
        !            55: can legitimately return the value \-1, it is necessary
        !            56: to clear the external variable \fIerrno\fP prior to the
        !            57: call, then check it afterward to determine
        !            58: if a \-1 is an error or a legitimate value.
        !            59: The
        !            60: .I setpriority
        !            61: call returns 0 if there is no error, or
        !            62: \-1 if there is.
        !            63: .SH ERRORS
        !            64: .I Getpriority
        !            65: and
        !            66: .I setpriority
        !            67: may return one of the following errors:
        !            68: .TP 15
        !            69: [ESRCH]
        !            70: No process(es) were located using the 
        !            71: .I which
        !            72: and
        !            73: .I who
        !            74: values specified.
        !            75: .TP 15
        !            76: [EINVAL]
        !            77: .I Which
        !            78: was not one of PRIO_PROCESS, PRIO_PGRP, or PRIO_USER.
        !            79: .PP
        !            80: In addition to the errors indicated above,
        !            81: .I setpriority
        !            82: may fail with one of the following errors returned:
        !            83: .TP 15
        !            84: [EACCES]
        !            85: A process was located, but neither its effective nor real user
        !            86: ID matched the effective user ID of the caller.
        !            87: .TP 15
        !            88: [EACCES]
        !            89: A non super-user attempted to change a process
        !            90: priority to a negative value.
        !            91: .SH "SEE ALSO"
        !            92: nice(1), fork(2), renice(8)

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