1 /*
2 * Helper functions for handling target threads/cpus
3 *
4 * Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com>
5 *
6 * Released under the GPL v2.
7 */
8
9 #include "target.h"
10 #include "debug.h"
11
12 #include <pwd.h>
13 #include <string.h>
14
15
perf_target__validate(struct perf_target * target)16 enum perf_target_errno perf_target__validate(struct perf_target *target)
17 {
18 enum perf_target_errno ret = PERF_ERRNO_TARGET__SUCCESS;
19
20 if (target->pid)
21 target->tid = target->pid;
22
23 /* CPU and PID are mutually exclusive */
24 if (target->tid && target->cpu_list) {
25 target->cpu_list = NULL;
26 if (ret == PERF_ERRNO_TARGET__SUCCESS)
27 ret = PERF_ERRNO_TARGET__PID_OVERRIDE_CPU;
28 }
29
30 /* UID and PID are mutually exclusive */
31 if (target->tid && target->uid_str) {
32 target->uid_str = NULL;
33 if (ret == PERF_ERRNO_TARGET__SUCCESS)
34 ret = PERF_ERRNO_TARGET__PID_OVERRIDE_UID;
35 }
36
37 /* UID and CPU are mutually exclusive */
38 if (target->uid_str && target->cpu_list) {
39 target->cpu_list = NULL;
40 if (ret == PERF_ERRNO_TARGET__SUCCESS)
41 ret = PERF_ERRNO_TARGET__UID_OVERRIDE_CPU;
42 }
43
44 /* PID and SYSTEM are mutually exclusive */
45 if (target->tid && target->system_wide) {
46 target->system_wide = false;
47 if (ret == PERF_ERRNO_TARGET__SUCCESS)
48 ret = PERF_ERRNO_TARGET__PID_OVERRIDE_SYSTEM;
49 }
50
51 /* UID and SYSTEM are mutually exclusive */
52 if (target->uid_str && target->system_wide) {
53 target->system_wide = false;
54 if (ret == PERF_ERRNO_TARGET__SUCCESS)
55 ret = PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM;
56 }
57
58 return ret;
59 }
60
perf_target__parse_uid(struct perf_target * target)61 enum perf_target_errno perf_target__parse_uid(struct perf_target *target)
62 {
63 struct passwd pwd, *result;
64 char buf[1024];
65 const char *str = target->uid_str;
66
67 target->uid = UINT_MAX;
68 if (str == NULL)
69 return PERF_ERRNO_TARGET__SUCCESS;
70
71 /* Try user name first */
72 getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
73
74 if (result == NULL) {
75 /*
76 * The user name not found. Maybe it's a UID number.
77 */
78 char *endptr;
79 int uid = strtol(str, &endptr, 10);
80
81 if (*endptr != '\0')
82 return PERF_ERRNO_TARGET__INVALID_UID;
83
84 getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
85
86 if (result == NULL)
87 return PERF_ERRNO_TARGET__USER_NOT_FOUND;
88 }
89
90 target->uid = result->pw_uid;
91 return PERF_ERRNO_TARGET__SUCCESS;
92 }
93
94 /*
95 * This must have a same ordering as the enum perf_target_errno.
96 */
97 static const char *perf_target__error_str[] = {
98 "PID/TID switch overriding CPU",
99 "PID/TID switch overriding UID",
100 "UID switch overriding CPU",
101 "PID/TID switch overriding SYSTEM",
102 "UID switch overriding SYSTEM",
103 "Invalid User: %s",
104 "Problems obtaining information for user %s",
105 };
106
perf_target__strerror(struct perf_target * target,int errnum,char * buf,size_t buflen)107 int perf_target__strerror(struct perf_target *target, int errnum,
108 char *buf, size_t buflen)
109 {
110 int idx;
111 const char *msg;
112
113 BUG_ON(buflen == 0);
114
115 if (errnum >= 0) {
116 const char *err = strerror_r(errnum, buf, buflen);
117
118 if (err != buf) {
119 size_t len = strlen(err);
120 memcpy(buf, err, min(buflen - 1, len));
121 *(buf + min(buflen - 1, len)) = '\0';
122 }
123
124 return 0;
125 }
126
127 if (errnum < __PERF_ERRNO_TARGET__START ||
128 errnum >= __PERF_ERRNO_TARGET__END)
129 return -1;
130
131 idx = errnum - __PERF_ERRNO_TARGET__START;
132 msg = perf_target__error_str[idx];
133
134 switch (errnum) {
135 case PERF_ERRNO_TARGET__PID_OVERRIDE_CPU
136 ... PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM:
137 snprintf(buf, buflen, "%s", msg);
138 break;
139
140 case PERF_ERRNO_TARGET__INVALID_UID:
141 case PERF_ERRNO_TARGET__USER_NOT_FOUND:
142 snprintf(buf, buflen, msg, target->uid_str);
143 break;
144
145 default:
146 /* cannot reach here */
147 break;
148 }
149
150 return 0;
151 }
152