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sched_getaffinity(2) update:

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- dynamically calculate the cpu mask size,
- return it upon success,
- fix generated cpu mask.
This commit is contained in:
njoly 2009-06-23 13:18:59 +00:00
parent b492933390
commit de2e7a9c8e
1 changed files with 17 additions and 16 deletions
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33
sys/compat/linux/common/linux_sched.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_sched.c,v 1.59 2009/06/18 20:36:28 njoly Exp $ */
/* $NetBSD: linux_sched.c,v 1.60 2009/06/23 13:18:59 njoly Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -35,7 +35,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_sched.c,v 1.59 2009/06/18 20:36:28 njoly Exp $");
__KERNEL_RCSID(0, "$NetBSD: linux_sched.c,v 1.60 2009/06/23 13:18:59 njoly Exp $");
#include <sys/param.h>
#include <sys/mount.h>
@ -622,15 +622,12 @@ linux_sys_sched_getaffinity(struct lwp *l, const struct linux_sys_sched_getaffin
syscallarg(unsigned int) len;
syscallarg(unsigned long *) mask;
} */
int error;
int ret;
char *data;
int *retp;
int error, size, nb = ncpu;
unsigned long *p, *data;
if (SCARG(uap, mask) == NULL)
return EINVAL;
if (SCARG(uap, len) < sizeof(int))
/* Unlike Linux, dynamically calculate cpu mask size */
size = sizeof(long) * ((ncpu + LONG_BIT - 1) / LONG_BIT);
if (SCARG(uap, len) < size)
return EINVAL;
if (pfind(SCARG(uap, pid)) == NULL)
@ -641,14 +638,18 @@ linux_sys_sched_getaffinity(struct lwp *l, const struct linux_sys_sched_getaffin
* The result is a mask, the first CPU being in the least significant
* bit.
*/
ret = (1 << ncpu) - 1;
data = malloc(SCARG(uap, len), M_TEMP, M_WAITOK|M_ZERO);
retp = (int *)&data[SCARG(uap, len) - sizeof(ret)];
*retp = ret;
error = copyout(data, SCARG(uap, mask), SCARG(uap, len));
data = malloc(size, M_TEMP, M_WAITOK|M_ZERO);
p = data;
while (nb > LONG_BIT) {
*p++ = ~0UL;
nb -= LONG_BIT;
}
if (nb)
*p = (1 << ncpu) - 1;
error = copyout(data, SCARG(uap, mask), size);
free(data, M_TEMP);
*retval = size;
return error;