SCHED_SETPARAM(2)         (2019-10-10)          SCHED_SETPARAM(2)

     NAME
          sched_setparam, sched_getparam - set and get scheduling
          parameters

     SYNOPSIS
          #include <sched.h>

          int sched_setparam(pid_t pid, const struct sched_param *param);

          int sched_getparam(pid_t pid, struct sched_param *param);

          struct sched_param {
              ...
              int sched_priority;
              ...
          };

     DESCRIPTION
          sched_setparam() sets the scheduling parameters associated
          with the scheduling policy for the thread whose thread ID is
          specified in pid.  If pid is zero, then the parameters of
          the calling thread are set.  The interpretation of the argu-
          ment param depends on the scheduling policy of the thread
          identified by pid. See sched(7) for a description of the
          scheduling policies supported under Linux.

          sched_getparam() retrieves the scheduling parameters for the
          thread identified by pid.  If pid is zero, then the parame-
          ters of the calling thread are retrieved.

          sched_setparam() checks the validity of param for the
          scheduling policy of the thread.  The value
          param->sched_priority must lie within the range given by
          sched_get_priority_min(2) and sched_get_priority_max(2).

          For a discussion of the privileges and resource limits
          related to scheduling priority and policy, see sched(7).

          POSIX systems on which sched_setparam() and sched_getparam()
          are available define _POSIX_PRIORITY_SCHEDULING in
          <unistd.h>.

     RETURN VALUE
          On success, sched_setparam() and sched_getparam() return 0.
          On error, -1 is returned, and errno is set appropriately.

     ERRORS
          EINVAL
               Invalid arguments: param is NULL or pid is negative

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     SCHED_SETPARAM(2)         (2019-10-10)          SCHED_SETPARAM(2)

          EINVAL
               (sched_setparam()) The argument param does not make
               sense for the current scheduling policy.

          EPERM
               (sched_setparam()) The caller does not have appropriate
               privileges (Linux: does not have the CAP_SYS_NICE capa-
               bility).

          ESRCH
               The thread whose ID is pid could not be found.

     CONFORMING TO
          POSIX.1-2001, POSIX.1-2008.

     SEE ALSO
          getpriority(2), gettid(2), nice(2),
          sched_get_priority_max(2), sched_get_priority_min(2),
          sched_getaffinity(2), sched_getscheduler(2),
          sched_setaffinity(2), sched_setattr(2),
          sched_setscheduler(2), setpriority(2), capabilities(7),
          sched(7)

     COLOPHON
          This page is part of release 5.10 of the Linux man-pages
          project.  A description of the project, information about
          reporting bugs, and the latest version of this page, can be
          found at https://www.kernel.org/doc/man-pages/.

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