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taskset: fix some careless code in both fancy and non-fancy cases.

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-5 bytes for fancy, +5 for non-fancy
This commit is contained in:
Denis Vlasenko 2008-07-11 13:57:08 +00:00
parent 88643a86d0
commit 0e52541917
3 changed files with 39 additions and 15 deletions
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4
libbb/mode_string.c
View File

@ -48,7 +48,7 @@ static const mode_t mode_flags[] = {
/* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
* and 'B' types don't appear to be available on linux. So I removed them. */
static const char type_chars[16] ALIGN1 = "?pc?d?b?-?l?s???";
/* 0123456789abcdef */
/***************************************** 0123456789abcdef */
static const char mode_chars[7] ALIGN1 = "rwxSTst";
const char* FAST_FUNC bb_mode_string(mode_t mode)
@ -88,7 +88,7 @@ const char* FAST_FUNC bb_mode_string(mode_t mode)
/* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
* and 'B' types don't appear to be available on linux. So I removed them. */
static const char type_chars[16] = "?pc?d?b?-?l?s???";
/* 0123456789abcdef */
/********************************** 0123456789abcdef */
static const char mode_chars[7] = "rwxSTst";
const char* FAST_FUNC bb_mode_string(mode_t mode)

2
miscutils/last.c
View File

@ -117,6 +117,8 @@ int last_main(int argc, char **argv UNUSED_PARAM)
strcpy(ut.ut_line, "system boot");
}
}
/* manpages say ut_tv.tv_sec *is* time_t,
* but some systems have it wrong */
t_tmp = (time_t)ut.ut_tv.tv_sec;
printf("%-10s %-14s %-18s %-12.12s\n",
ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4);

48
miscutils/taskset.c
View File

@ -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