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Date: Wed, 2 Mar 2016 17:26:26 +0100
From: Nathan Zadoks <nathan@...han7.eu>
To: musl@...ts.openwall.com
Cc: Nathan Zadoks <nathan@...han7.eu>
Subject: [PATCH 1/2] add sched_getcpu
This is a GNU extension, but a fairly minor one, for a system call that
otherwise has no libc wrapper.
Adding it was discussed previously, without any objections:
http://www.openwall.com/lists/musl/2015/05/08/24
---
include/sched.h | 1 +
src/sched/sched_getcpu.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
create mode 100644 src/sched/sched_getcpu.c
diff --git a/include/sched.h b/include/sched.h
index 3e34a72..7e88f09 100644
--- a/include/sched.h
+++ b/include/sched.h
@@ -76,6 +76,7 @@ void free(void *);
typedef struct cpu_set_t { unsigned long __bits[128/sizeof(long)]; } cpu_set_t;
int __sched_cpucount(size_t, const cpu_set_t *);
+int sched_getcpu(void);
int sched_getaffinity(pid_t, size_t, cpu_set_t *);
int sched_setaffinity(pid_t, size_t, const cpu_set_t *);
diff --git a/src/sched/sched_getcpu.c b/src/sched/sched_getcpu.c
new file mode 100644
index 0000000..760e4d5
--- /dev/null
+++ b/src/sched/sched_getcpu.c
@@ -0,0 +1,13 @@
+#define _GNU_SOURCE
+#include <sched.h>
+#include "syscall.h"
+
+int sched_getcpu(void)
+{
+ int r;
+ unsigned cpu;
+
+ r = __syscall(SYS_getcpu, &cpu, 0, 0);
+ if (!r) return cpu;
+ return __syscall_ret(r);
+}
--
2.7.1
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