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Message-Id: <1456935987-24047-2-git-send-email-nathan@nathan7.eu> 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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