rtsched.2 (2010 09)

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rtsched(2) rtsched(2)

ERRORS

If the functions fail, errno is set to one of the following values.

sched_setparam()

[EACCES] The target process could not be accessed due to compartmental restrictions.

[EFAULT] The param argument points to an invalid address.

[EINVAL] One or more of the requested scheduling parameters is outside the range deﬁned for

the scheduling policy of the speciﬁed pid.

[ENOSYS] The function is not supported by this implementation.

[EPERM] The requesting process does not have permission to set the scheduling parameters

for the speciﬁed process, or does not have the

RTSCHED privilege to invoke

sched_setparam()

[ESRCH] No process can be found corresponding to that speciﬁed by pid .

sched_getparam()

[EACCES] The target process could not be accessed due to compartmental restrictions.

[EFAULT] The param argument points to an invalid address.

[ENOSYS] The function is not supported by this implementation.

[ESRCH] No process can be found corresponding to that speciﬁed by pid .

sched_setscheduler()

[EACCES] The target process could not be accessed due to compartmental restrictions.

[EFAULT] The param argument points to an invalid address.

[EINVAL] The value of the policy parameter is invalid, or one or more of the parameters con-

tained in param is outside the valid range for the speciﬁed scheduling policy.

[ENOSYS] The function is not supported by this implementation.

[EPERM] The requesting process does not have permission to set the scheduling policy of the

speciﬁed process.

[ESRCH] No process can be found corresponding to that speciﬁed by pid .

sched_getscheduler()

[EACCES] The target process could not be accessed due to compartmental restrictions.

[ENOSYS] The function is not supported by this implementation.

[ESRCH] No process can be found corresponding to that speciﬁed by pid .

sched_yield()

[ENOSYS] The function is not supported by this implementation.

sched_get_priority_max(), sched_get_priority_min()

[EINVAL] The value of the policy parameter does not represent a deﬁned scheduling policy.

[ENOSYS] The function is not supported by this implementation.

sched_rr_get_interval()

[ENOSYS] The function is not supported by this implementation.

[ESRCH] No process can be found corresponding to that speciﬁed by pid .

EXAMPLES

Change the calling process to use the strongest

FIFO priority:

#include <sched.h>

struct sched_param param;

int maxpri;

maxpri = sched_get_priority_max(SCHED_FIFO);

if (maxpri == -1) {

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