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authorJoakim Tjernlund <joakim.tjernlund@transmode.se>2007-02-12 22:52:32 +0000
committerJoakim Tjernlund <joakim.tjernlund@transmode.se>2007-02-12 22:52:32 +0000
commitd8761c147db463209939f7c6a11da3a6fb1feecf (patch)
tree04e6e5178ca9eb109045d4528cb782033a8754a7 /libc/sysdeps
parented57cd6c59f80fa1061aa312d7f4fc31da142f30 (diff)
Impl. linux syscalls sched_getaffinity/sched_setaffinity but
protect its use by #ifdef INTERNAL_SYSCALL since not all arch's has INTERNAL_SYSCALL. All arch's not having INTERNAL_SYSCALL in libc/sysdeps/linux/<arch>/bits/syscalls.h should get an update from glibc.
Diffstat (limited to 'libc/sysdeps')
-rw-r--r--libc/sysdeps/linux/common/sched_getaffinity.c52
-rw-r--r--libc/sysdeps/linux/common/sched_setaffinity.c78
2 files changed, 130 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/sched_getaffinity.c b/libc/sysdeps/linux/common/sched_getaffinity.c
new file mode 100644
index 000000000..da1acc855
--- /dev/null
+++ b/libc/sysdeps/linux/common/sched_getaffinity.c
@@ -0,0 +1,52 @@
+/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <features.h>
+#ifdef __USE_GNU
+
+#include <sched.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+#ifdef INTERNAL_SYSCALL /* remove this when all archs has this #defined */
+
+#include <string.h>
+#include <sys/param.h>
+#include <sys/types.h>
+
+libc_hidden_proto(memset)
+
+#define __NR___syscall_sched_getaffinity __NR_sched_getaffinity
+static inline _syscall3(int, __syscall_sched_getaffinity, __kernel_pid_t, pid,
+ size_t, cpusetsize, cpu_set_t *, cpuset);
+
+int sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)
+{
+ int res = (__syscall_sched_getaffinity(pid, MIN(INT_MAX, cpusetsize),
+ cpuset));
+
+ if (res != -1) {
+ /* Clean the rest of the memory the kernel didn't do. */
+ memset ((char *) cpuset + res, '\0', cpusetsize - res);
+
+ res = 0;
+ }
+ return res;
+}
+#endif
+#endif
diff --git a/libc/sysdeps/linux/common/sched_setaffinity.c b/libc/sysdeps/linux/common/sched_setaffinity.c
new file mode 100644
index 000000000..a25fbe356
--- /dev/null
+++ b/libc/sysdeps/linux/common/sched_setaffinity.c
@@ -0,0 +1,78 @@
+/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <features.h>
+#ifdef __USE_GNU
+
+#include <sched.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+#ifdef INTERNAL_SYSCALL /* remove this when all archs has this #defined */
+
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <alloca.h>
+
+libc_hidden_proto(getpid)
+
+#define __NR___syscall_sched_setaffinity __NR_sched_setaffinity
+static inline _syscall3(int, __syscall_sched_setaffinity, __kernel_pid_t, pid,
+ size_t, cpusetsize, cpu_set_t *, cpuset);
+
+static size_t __kernel_cpumask_size;
+
+int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
+{
+ size_t cnt;
+ if (unlikely (__kernel_cpumask_size == 0)) {
+ INTERNAL_SYSCALL_DECL (err);
+ int res;
+ size_t psize = 128;
+ void *p = alloca (psize);
+
+ while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, getpid (),
+ psize, p),
+ INTERNAL_SYSCALL_ERROR_P (res, err)
+ && INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
+ p = extend_alloca (p, psize, 2 * psize);
+
+ if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) {
+ __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
+ return -1;
+ }
+
+ __kernel_cpumask_size = res;
+ }
+
+ /* We now know the size of the kernel cpumask_t. Make sure the user
+ does not request to set a bit beyond that. */
+ for (cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
+ if (((char *) cpuset)[cnt] != '\0') {
+ /* Found a nonzero byte. This means the user request cannot be
+ fulfilled. */
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ return INLINE_SYSCALL (sched_setaffinity, 3, pid, cpusetsize, cpuset);
+}
+#endif
+#endif