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getpriority (2)
  • >> getpriority (2) ( FreeBSD man: Системные вызовы )
  • getpriority (2) ( Русские man: Системные вызовы )
  • getpriority (2) ( Linux man: Системные вызовы )
  • getpriority (3) ( Solaris man: Библиотечные вызовы )
  • getpriority (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    getpriority
    
     
    setpriority
    
     - get/set program scheduling priority
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <sys/time.h>
       #include <sys/resource.h>
    int getpriority (int which int who);
    int setpriority (int which int who int prio);
     

    DESCRIPTION

    The scheduling priority of the process, process group, or user, as indicated by Fa which and Fa who is obtained with the getpriority ();
    system call and set with the setpriority ();
    system call. The Fa which argument is one of PRIO_PROCESS PRIO_PGRP or PRIO_USER and Fa who is interpreted relative to Fa which (a process identifier for PRIO_PROCESS process group identifier for PRIO_PGRP and a user ID for PRIO_USER ) A zero value of Fa who denotes the current process, process group, or user. The Fa prio argument is a value in the range -20 to 20. The default priority is 0; lower priorities cause more favorable scheduling.

    The getpriority ();
    system call returns the highest priority (lowest numerical value) enjoyed by any of the specified processes. The setpriority ();
    system 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.

    Rv -std setpriority  

    ERRORS

    The getpriority ();
    and setpriority ();
    system calls will fail if:

    Bq Er ESRCH
    No process was located using the Fa which and Fa who values specified.
    Bq Er EINVAL
    The Fa which argument was not one of PRIO_PROCESS PRIO_PGRP or PRIO_USER

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

    Bq Er EPERM
    A process was located, but neither its effective nor real user ID matched the effective user ID of the caller.
    Bq Er EACCES
    A non super-user attempted to lower a process priority.

     

    SEE ALSO

    nice(1), fork(2), renice(8)  

    HISTORY

    The getpriority ();
    system call appeared in BSD 4.2


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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