summaryrefslogtreecommitdiff
path: root/miscutils/taskset.c
diff options
context:
space:
mode:
Diffstat (limited to 'miscutils/taskset.c')
-rw-r--r--miscutils/taskset.c48
1 files changed, 35 insertions, 13 deletions
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
index 3175af1..b43d42e 100644
--- a/miscutils/taskset.c
+++ b/miscutils/taskset.c
@@ -11,31 +11,53 @@
#if ENABLE_FEATURE_TASKSET_FANCY
#define TASKSET_PRINTF_MASK "%s"
-#define from_cpuset(x) __from_cpuset(&x)
/* craft a string from the mask */
-static char *__from_cpuset(cpu_set_t *mask)
+static char *from_cpuset(cpu_set_t *mask)
{
int i;
- char *ret = 0, *str = xzalloc(9);
+ char *ret = NULL;
+ char *str = xzalloc((CPU_SETSIZE / 4) + 1); /* we will leak it */
for (i = CPU_SETSIZE - 4; i >= 0; i -= 4) {
- char val = 0;
+ int val = 0;
int off;
for (off = 0; off <= 3; ++off)
- if (CPU_ISSET(i+off, mask))
- val |= 1<<off;
-
+ if (CPU_ISSET(i + off, mask))
+ val |= 1 << off;
if (!ret && val)
ret = str;
- *str++ = (val-'0'<=9) ? (val+48) : (val+87);
+ *str++ = bb_hexdigits_upcase[val] | 0x20;
}
return ret;
}
#else
-#define TASKSET_PRINTF_MASK "%x"
-/* (void*) cast is for battling gcc: */
-/* "dereferencing type-punned pointer will break strict-aliasing rules" */
-#define from_cpuset(mask) (*(unsigned*)(void*)&(mask))
+#define TASKSET_PRINTF_MASK "%llx"
+static unsigned long long from_cpuset(cpu_set_t *mask)
+{
+ struct BUG_CPU_SETSIZE_is_too_small {
+ char BUG_CPU_SETSIZE_is_too_small[
+ CPU_SETSIZE < sizeof(int) ? -1 : 1];
+ };
+ char *p = (void*)mask;
+
+ /* Take the least significant bits. Careful!
+ * Consider both CPU_SETSIZE=4 and CPU_SETSIZE=1024 cases
+ */
+#if BB_BIG_ENDIAN
+ /* For big endian, it means LAST bits */
+ if (CPU_SETSIZE < sizeof(long))
+ p += CPU_SETSIZE - sizeof(int);
+ else if (CPU_SETSIZE < sizeof(long long))
+ p += CPU_SETSIZE - sizeof(long);
+ else
+ p += CPU_SETSIZE - sizeof(long long);
+#endif
+ if (CPU_SETSIZE < sizeof(long))
+ return *(unsigned*)p;
+ if (CPU_SETSIZE < sizeof(long long))
+ return *(unsigned long*)p;
+ return *(unsigned long long*)p;
+}
#endif
@@ -78,7 +100,7 @@ int taskset_main(int argc UNUSED_PARAM, char **argv)
if (sched_getaffinity(pid, sizeof(mask), &mask) < 0)
bb_perror_msg_and_die("can't %cet pid %d's affinity", 'g', pid);
printf("pid %d's %s affinity mask: "TASKSET_PRINTF_MASK"\n",
- pid, current_new, from_cpuset(mask));
+ pid, current_new, from_cpuset(&mask));
if (!*argv) {
/* Either it was just "-p <pid>",
* or it was "-p <aff> <pid>" and we came here