1 /* 2 * Helper functions for handling target threads/cpus 3 * 4 * Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim (at) 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 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 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 }; 106 107 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
