cg_processors(2)

cg_processors -- return the processors within a CPU-Group

Synopsis

#include <sys/cguser.h>
#include <sys/processor.h>

int cg_processors(
        cgid_t cgid,
        int selector,
        int nprocessorids,
        processorid_t *processorid_array);

Description

cg_processors obtains a list of the processors within a CPU-Group and stores the result in the array of processor IDs specified by processorid_array. This array has nprocessorids entries and must be large enough to contain the entire list.

The cgid parameter specifies the CPU-Group for which the contained processor identifiers are to be returned. The special value CG_CURRENT may be used as shorthand for the caller's current CPU-Group.

The selector parameter takes the value P_ONLINE.

If the CPU-Group is not online, cg_processors fails with EAGAIN.

Return values

On success, cg_processors returns the number of selected processors within the CPU-Group. On failure, cg_processors returns a value of -1 and sets errno to indicate the error:

[EAGAIN]: The CPU-Group was not online
[EINVAL]: selector contains an invalid value
[EINVAL]: cgid contains an invalid value
[ENOSPC]: The value of nprocessorids is less than the number of specified processors in the CPU-Group.
[EFAULT]: A referenced part of the array pointed to by processorid_array is outside of the allocated address space of the process.
[ENOSYS]: The cg_processors call is not supported by the system.

References

cg_ids(2), cg_info(2), sysconf(3C)