152 строки
3.4 KiB
C
152 строки
3.4 KiB
C
/*
|
|
* Helper functions for handling target threads/cpus
|
|
*
|
|
* Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com>
|
|
*
|
|
* Released under the GPL v2.
|
|
*/
|
|
|
|
#include "target.h"
|
|
#include "debug.h"
|
|
|
|
#include <pwd.h>
|
|
#include <string.h>
|
|
|
|
|
|
enum perf_target_errno perf_target__validate(struct perf_target *target)
|
|
{
|
|
enum perf_target_errno ret = PERF_ERRNO_TARGET__SUCCESS;
|
|
|
|
if (target->pid)
|
|
target->tid = target->pid;
|
|
|
|
/* CPU and PID are mutually exclusive */
|
|
if (target->tid && target->cpu_list) {
|
|
target->cpu_list = NULL;
|
|
if (ret == PERF_ERRNO_TARGET__SUCCESS)
|
|
ret = PERF_ERRNO_TARGET__PID_OVERRIDE_CPU;
|
|
}
|
|
|
|
/* UID and PID are mutually exclusive */
|
|
if (target->tid && target->uid_str) {
|
|
target->uid_str = NULL;
|
|
if (ret == PERF_ERRNO_TARGET__SUCCESS)
|
|
ret = PERF_ERRNO_TARGET__PID_OVERRIDE_UID;
|
|
}
|
|
|
|
/* UID and CPU are mutually exclusive */
|
|
if (target->uid_str && target->cpu_list) {
|
|
target->cpu_list = NULL;
|
|
if (ret == PERF_ERRNO_TARGET__SUCCESS)
|
|
ret = PERF_ERRNO_TARGET__UID_OVERRIDE_CPU;
|
|
}
|
|
|
|
/* PID and SYSTEM are mutually exclusive */
|
|
if (target->tid && target->system_wide) {
|
|
target->system_wide = false;
|
|
if (ret == PERF_ERRNO_TARGET__SUCCESS)
|
|
ret = PERF_ERRNO_TARGET__PID_OVERRIDE_SYSTEM;
|
|
}
|
|
|
|
/* UID and SYSTEM are mutually exclusive */
|
|
if (target->uid_str && target->system_wide) {
|
|
target->system_wide = false;
|
|
if (ret == PERF_ERRNO_TARGET__SUCCESS)
|
|
ret = PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
enum perf_target_errno perf_target__parse_uid(struct perf_target *target)
|
|
{
|
|
struct passwd pwd, *result;
|
|
char buf[1024];
|
|
const char *str = target->uid_str;
|
|
|
|
target->uid = UINT_MAX;
|
|
if (str == NULL)
|
|
return PERF_ERRNO_TARGET__SUCCESS;
|
|
|
|
/* Try user name first */
|
|
getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
|
|
|
|
if (result == NULL) {
|
|
/*
|
|
* The user name not found. Maybe it's a UID number.
|
|
*/
|
|
char *endptr;
|
|
int uid = strtol(str, &endptr, 10);
|
|
|
|
if (*endptr != '\0')
|
|
return PERF_ERRNO_TARGET__INVALID_UID;
|
|
|
|
getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
|
|
|
|
if (result == NULL)
|
|
return PERF_ERRNO_TARGET__USER_NOT_FOUND;
|
|
}
|
|
|
|
target->uid = result->pw_uid;
|
|
return PERF_ERRNO_TARGET__SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* This must have a same ordering as the enum perf_target_errno.
|
|
*/
|
|
static const char *perf_target__error_str[] = {
|
|
"PID/TID switch overriding CPU",
|
|
"PID/TID switch overriding UID",
|
|
"UID switch overriding CPU",
|
|
"PID/TID switch overriding SYSTEM",
|
|
"UID switch overriding SYSTEM",
|
|
"Invalid User: %s",
|
|
"Problems obtaining information for user %s",
|
|
};
|
|
|
|
int perf_target__strerror(struct perf_target *target, int errnum,
|
|
char *buf, size_t buflen)
|
|
{
|
|
int idx;
|
|
const char *msg;
|
|
|
|
BUG_ON(buflen == 0);
|
|
|
|
if (errnum >= 0) {
|
|
const char *err = strerror_r(errnum, buf, buflen);
|
|
|
|
if (err != buf) {
|
|
size_t len = strlen(err);
|
|
memcpy(buf, err, min(buflen - 1, len));
|
|
*(buf + min(buflen - 1, len)) = '\0';
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (errnum < __PERF_ERRNO_TARGET__START ||
|
|
errnum >= __PERF_ERRNO_TARGET__END)
|
|
return -1;
|
|
|
|
idx = errnum - __PERF_ERRNO_TARGET__START;
|
|
msg = perf_target__error_str[idx];
|
|
|
|
switch (errnum) {
|
|
case PERF_ERRNO_TARGET__PID_OVERRIDE_CPU
|
|
... PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM:
|
|
snprintf(buf, buflen, "%s", msg);
|
|
break;
|
|
|
|
case PERF_ERRNO_TARGET__INVALID_UID:
|
|
case PERF_ERRNO_TARGET__USER_NOT_FOUND:
|
|
snprintf(buf, buflen, msg, target->uid_str);
|
|
break;
|
|
|
|
default:
|
|
/* cannot reach here */
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|