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cpuset: Add compat shim to the sched_affinity functions
To allow to run a newer world on a pre-1400079 kernel a compat shims to the sched_affinity functions has beed added. Reported by: antoine Tested by: antoine Reviewed by: kib Differential revision: https://reviews.freebsd.org/D38555 MFC after: 3 days
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@ -26,16 +26,29 @@
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* SUCH DAMAGE.
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*/
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#define _WANT_P_OSREL
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#include <sys/param.h>
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#include <errno.h>
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#include <sched.h>
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#include <string.h>
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#include "libc_private.h"
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int
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sched_getaffinity(pid_t pid, size_t cpusetsz, cpuset_t *cpuset)
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{
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cpuwhich_t which;
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int error;
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error = cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TIDPID,
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if (__getosreldate() < P_OSREL_TIDPID) {
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if (pid == 0 || pid > _PID_MAX)
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which = CPU_WHICH_TID;
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else
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which = CPU_WHICH_PID;
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} else
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which = CPU_WHICH_TIDPID;
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error = cpuset_getaffinity(CPU_LEVEL_WHICH, which,
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pid == 0 ? -1 : pid, cpusetsz, cpuset);
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if (error == -1 && errno == ERANGE)
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errno = EINVAL;
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@ -26,20 +26,32 @@
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* SUCH DAMAGE.
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*/
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#define _WANT_P_OSREL
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <sched.h>
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#include <string.h>
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#include "libc_private.h"
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int
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sched_setaffinity(pid_t pid, size_t cpusetsz, const cpuset_t *cpuset)
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{
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static int mp_maxid;
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cpuwhich_t which;
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cpuset_t c;
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int error, lbs, cpu;
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size_t len, sz;
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if (__getosreldate() < P_OSREL_TIDPID) {
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if (pid == 0 || pid > _PID_MAX)
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which = CPU_WHICH_TID;
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else
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which = CPU_WHICH_PID;
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} else
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which = CPU_WHICH_TIDPID;
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sz = cpusetsz > sizeof(cpuset_t) ? sizeof(cpuset_t) : cpusetsz;
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memset(&c, 0, sizeof(c));
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memcpy(&c, cpuset, sz);
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@ -58,7 +70,7 @@ sched_setaffinity(pid_t pid, size_t cpusetsz, const cpuset_t *cpuset)
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if (cpu > mp_maxid)
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CPU_CLR(cpu, &c);
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}
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error = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TIDPID,
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error = cpuset_setaffinity(CPU_LEVEL_WHICH, which,
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pid == 0 ? -1 : pid, sizeof(cpuset_t), &c);
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if (error == -1 && errno == EDEADLK)
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errno = EINVAL;
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@ -39,6 +39,12 @@
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#include <sys/_types.h>
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#include <sys/_pthreadtypes.h>
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/*
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* The kernel doesn't expose PID_MAX to the user space. Save it here
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* to allow to run a newer world on a pre-1400079 kernel.
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*/
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#define _PID_MAX 99999
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/*
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* This global flag is non-zero when a process has created one
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* or more threads. It is used to avoid calling locking functions
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@ -107,6 +107,7 @@
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#define P_OSREL_CK_SUPERBLOCK 1300000
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#define P_OSREL_CK_INODE 1300005
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#define P_OSREL_POWERPC_NEW_AUX_ARGS 1300070
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#define P_OSREL_TIDPID 1400079
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#define P_OSREL_MAJOR(x) ((x) / 100000)
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#endif
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