2012-04-26 12:15:22 +07:00
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/*
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* Helper functions for handling target threads/cpus
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*
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* Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com>
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*
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* Released under the GPL v2.
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*/
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#include "target.h"
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2016-07-07 21:38:09 +07:00
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#include "util.h"
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2012-04-26 12:15:22 +07:00
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#include "debug.h"
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2012-05-07 12:09:01 +07:00
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#include <pwd.h>
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2012-05-07 12:09:02 +07:00
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#include <string.h>
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2012-05-07 12:09:01 +07:00
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2012-04-26 12:15:22 +07:00
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2013-11-13 02:46:16 +07:00
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enum target_errno target__validate(struct target *target)
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2012-04-26 12:15:22 +07:00
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{
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2013-11-13 02:46:16 +07:00
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enum target_errno ret = TARGET_ERRNO__SUCCESS;
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2012-05-07 12:09:00 +07:00
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2012-04-26 12:15:22 +07:00
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if (target->pid)
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target->tid = target->pid;
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/* CPU and PID are mutually exclusive */
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if (target->tid && target->cpu_list) {
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target->cpu_list = NULL;
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2013-11-13 02:46:16 +07:00
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if (ret == TARGET_ERRNO__SUCCESS)
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ret = TARGET_ERRNO__PID_OVERRIDE_CPU;
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2012-04-26 12:15:22 +07:00
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}
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/* UID and PID are mutually exclusive */
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if (target->tid && target->uid_str) {
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target->uid_str = NULL;
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2013-11-13 02:46:16 +07:00
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if (ret == TARGET_ERRNO__SUCCESS)
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ret = TARGET_ERRNO__PID_OVERRIDE_UID;
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2012-04-26 12:15:22 +07:00
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}
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/* UID and CPU are mutually exclusive */
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if (target->uid_str && target->cpu_list) {
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target->cpu_list = NULL;
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2013-11-13 02:46:16 +07:00
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if (ret == TARGET_ERRNO__SUCCESS)
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ret = TARGET_ERRNO__UID_OVERRIDE_CPU;
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2012-04-26 12:15:22 +07:00
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}
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2012-05-07 12:09:00 +07:00
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/* PID and SYSTEM are mutually exclusive */
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if (target->tid && target->system_wide) {
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2012-04-26 12:15:22 +07:00
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target->system_wide = false;
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2013-11-13 02:46:16 +07:00
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if (ret == TARGET_ERRNO__SUCCESS)
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ret = TARGET_ERRNO__PID_OVERRIDE_SYSTEM;
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2012-04-26 12:15:22 +07:00
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}
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2012-05-07 12:09:00 +07:00
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/* UID and SYSTEM are mutually exclusive */
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if (target->uid_str && target->system_wide) {
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target->system_wide = false;
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2013-11-13 02:46:16 +07:00
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if (ret == TARGET_ERRNO__SUCCESS)
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ret = TARGET_ERRNO__UID_OVERRIDE_SYSTEM;
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2012-05-07 12:09:00 +07:00
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}
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2013-11-15 20:52:29 +07:00
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/* THREAD and SYSTEM/CPU are mutually exclusive */
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if (target->per_thread && (target->system_wide || target->cpu_list)) {
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target->per_thread = false;
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if (ret == TARGET_ERRNO__SUCCESS)
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ret = TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD;
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}
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2012-05-07 12:09:00 +07:00
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return ret;
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2012-04-26 12:15:22 +07:00
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}
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2012-05-07 12:09:01 +07:00
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2013-11-13 02:46:16 +07:00
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enum target_errno target__parse_uid(struct target *target)
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2012-05-07 12:09:01 +07:00
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{
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struct passwd pwd, *result;
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char buf[1024];
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const char *str = target->uid_str;
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target->uid = UINT_MAX;
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if (str == NULL)
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2013-11-13 02:46:16 +07:00
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return TARGET_ERRNO__SUCCESS;
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2012-05-07 12:09:01 +07:00
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/* Try user name first */
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getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
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if (result == NULL) {
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/*
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* The user name not found. Maybe it's a UID number.
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*/
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char *endptr;
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int uid = strtol(str, &endptr, 10);
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if (*endptr != '\0')
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2013-11-13 02:46:16 +07:00
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return TARGET_ERRNO__INVALID_UID;
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2012-05-07 12:09:01 +07:00
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getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
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if (result == NULL)
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2013-11-13 02:46:16 +07:00
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return TARGET_ERRNO__USER_NOT_FOUND;
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2012-05-07 12:09:01 +07:00
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}
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target->uid = result->pw_uid;
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2013-11-13 02:46:16 +07:00
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return TARGET_ERRNO__SUCCESS;
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2012-05-07 12:09:01 +07:00
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}
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2012-05-07 12:09:02 +07:00
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/*
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2013-11-13 02:46:16 +07:00
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* This must have a same ordering as the enum target_errno.
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2012-05-07 12:09:02 +07:00
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*/
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2013-11-13 02:46:16 +07:00
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static const char *target__error_str[] = {
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2012-05-07 12:09:02 +07:00
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"PID/TID switch overriding CPU",
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"PID/TID switch overriding UID",
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"UID switch overriding CPU",
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"PID/TID switch overriding SYSTEM",
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"UID switch overriding SYSTEM",
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2013-11-15 20:52:29 +07:00
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"SYSTEM/CPU switch overriding PER-THREAD",
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2012-05-07 12:09:02 +07:00
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"Invalid User: %s",
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"Problems obtaining information for user %s",
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};
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2013-11-13 02:46:16 +07:00
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int target__strerror(struct target *target, int errnum,
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2012-05-07 12:09:02 +07:00
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char *buf, size_t buflen)
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{
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int idx;
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const char *msg;
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2012-07-26 08:50:10 +07:00
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BUG_ON(buflen == 0);
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2012-07-24 04:06:54 +07:00
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2012-05-07 12:09:02 +07:00
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if (errnum >= 0) {
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tools: Introduce str_error_r()
The tools so far have been using the strerror_r() GNU variant, that
returns a string, be it the buffer passed or something else.
But that, besides being tricky in cases where we expect that the
function using strerror_r() returns the error formatted in a provided
buffer (we have to check if it returned something else and copy that
instead), breaks the build on systems not using glibc, like Alpine
Linux, where musl libc is used.
So, introduce yet another wrapper, str_error_r(), that has the GNU
interface, but uses the portable XSI variant of strerror_r(), so that
users rest asured that the provided buffer is used and it is what is
returned.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-d4t42fnf48ytlk8rjxs822tf@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-07-06 21:56:20 +07:00
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const char *err = str_error_r(errnum, buf, buflen);
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2012-07-24 04:06:54 +07:00
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2015-03-24 04:23:02 +07:00
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if (err != buf)
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scnprintf(buf, buflen, "%s", err);
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2012-07-24 04:06:54 +07:00
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2012-05-07 12:09:02 +07:00
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return 0;
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}
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2013-11-13 02:46:16 +07:00
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if (errnum < __TARGET_ERRNO__START || errnum >= __TARGET_ERRNO__END)
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2012-05-07 12:09:02 +07:00
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return -1;
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2013-11-13 02:46:16 +07:00
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idx = errnum - __TARGET_ERRNO__START;
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msg = target__error_str[idx];
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2012-05-07 12:09:02 +07:00
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switch (errnum) {
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2013-11-15 20:52:29 +07:00
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case TARGET_ERRNO__PID_OVERRIDE_CPU ...
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TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD:
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2012-05-07 12:09:02 +07:00
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snprintf(buf, buflen, "%s", msg);
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break;
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2013-11-13 02:46:16 +07:00
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case TARGET_ERRNO__INVALID_UID:
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case TARGET_ERRNO__USER_NOT_FOUND:
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2012-05-07 12:09:02 +07:00
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snprintf(buf, buflen, msg, target->uid_str);
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break;
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default:
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/* cannot reach here */
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break;
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}
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return 0;
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}
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