sched_getscheduler(2)sched_getscheduler(2)NAMEsched_getscheduler - get the scheduling policy of a process
C SYNOPSIS
#include <sched.h>
int sched_getscheduler (pid_t pid);
DESCRIPTION
The sched_getscheduler system call is used to get the scheduling policy
of the process specified by pid. If pid is set to zero, then the
scheduling policy of the caller is returned.
A process may obtain the scheduling policy of itself and any process
sharing the same real user ID [see getuid(2)]. To obtain the scheduling
policy of an unrelated process, the calling process must have the
CAP_SCHED_MGT capability [see capability].
If pid refers to a POSIX thread process [see pthreads(3P)] then this call
retrieves the scheduling policy that is shared by process scope and bound
scope threads.
sched_getscheduler will fail if one or more of the following are true:
[EINVAL] The process specified by pid is not executing with a
scheduling policy.
[EPERM] The calling process attempted to obtain the scheduling
policy of an unrelated process and the caller does not
have the CAP_SCHED_MGT capability.
[ESRCH] The process specified by pid does not exist.
SEE ALSOcapability(4), sched_setparam(2), sched_getparam(2),
sched_setscheduler(2), sched_yield(2), sched_get_priority_max(2),
sched_get_priority_min(2), sched_rr_get_interval(2), sproc(2), fork(2),
getuid(2), pthreads(5)DIAGNOSTICS
Upon successful completion, one of the following scheduling policies is
returned: SCHED_FIFO, SCHED_RR, SCHED_TS. These scheduling policies are
described in sched_setscheduler(2).
Otherwise, a value of -1 is returned and errno is set to indicate the
error.
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