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The perf_target__strerror() sets @buf to a string that describes the (perf_target-specific) error condition that is passed via @errnum. This is similar to strerror_r() and does same thing if @errnum has a standard errno value. Signed-off-by: Namhyung Kim <namhyung.kim@lge.com> Suggested-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Reviewed-by: David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1336367344-28071-6-git-send-email-namhyung.kim@lge.com [ committer note: No need to use PERF_ERRNO_TARGET__SUCCESS, use shorter idiom ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
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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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#include "debug.h"
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#include <pwd.h>
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#include <string.h>
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enum perf_target_errno perf_target__validate(struct perf_target *target)
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{
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enum perf_target_errno ret = PERF_ERRNO_TARGET__SUCCESS;
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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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if (ret == PERF_ERRNO_TARGET__SUCCESS)
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ret = PERF_ERRNO_TARGET__PID_OVERRIDE_CPU;
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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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if (ret == PERF_ERRNO_TARGET__SUCCESS)
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ret = PERF_ERRNO_TARGET__PID_OVERRIDE_UID;
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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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if (ret == PERF_ERRNO_TARGET__SUCCESS)
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ret = PERF_ERRNO_TARGET__UID_OVERRIDE_CPU;
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}
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/* PID and SYSTEM are mutually exclusive */
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if (target->tid && target->system_wide) {
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target->system_wide = false;
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if (ret == PERF_ERRNO_TARGET__SUCCESS)
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ret = PERF_ERRNO_TARGET__PID_OVERRIDE_SYSTEM;
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}
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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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if (ret == PERF_ERRNO_TARGET__SUCCESS)
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ret = PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM;
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}
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return ret;
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}
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enum perf_target_errno perf_target__parse_uid(struct perf_target *target)
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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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return PERF_ERRNO_TARGET__SUCCESS;
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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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return PERF_ERRNO_TARGET__INVALID_UID;
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getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
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if (result == NULL)
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return PERF_ERRNO_TARGET__USER_NOT_FOUND;
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}
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target->uid = result->pw_uid;
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return PERF_ERRNO_TARGET__SUCCESS;
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}
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/*
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* This must have a same ordering as the enum perf_target_errno.
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*/
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static const char *perf_target__error_str[] = {
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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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"Invalid User: %s",
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"Problems obtaining information for user %s",
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};
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int perf_target__strerror(struct perf_target *target, int errnum,
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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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if (errnum >= 0) {
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strerror_r(errnum, buf, buflen);
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return 0;
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}
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if (errnum < __PERF_ERRNO_TARGET__START ||
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errnum >= __PERF_ERRNO_TARGET__END)
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return -1;
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idx = errnum - __PERF_ERRNO_TARGET__START;
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msg = perf_target__error_str[idx];
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switch (errnum) {
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case PERF_ERRNO_TARGET__PID_OVERRIDE_CPU
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... PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM:
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snprintf(buf, buflen, "%s", msg);
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break;
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case PERF_ERRNO_TARGET__INVALID_UID:
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case PERF_ERRNO_TARGET__USER_NOT_FOUND:
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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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