| 1 | #ifndef _UST_COMPAT_H |
| 2 | #define _UST_COMPAT_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | * Copyright (C) 2016 Raphaƫl Beamonte <raphael.beamonte@gmail.com> |
| 7 | * Copyright (C) 2020 Michael Jeanson <mjeanson@efficios.com> |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; only |
| 12 | * version 2.1 of the License. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #include <pthread.h> |
| 25 | #include <errno.h> |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include <lttng/ust-abi.h> |
| 29 | |
| 30 | #define LTTNG_UST_PROCNAME_SUFFIX "-ust" |
| 31 | |
| 32 | |
| 33 | #if defined(HAVE_PTHREAD_SETNAME_NP_WITH_TID) |
| 34 | static inline |
| 35 | int lttng_pthread_setname_np(const char *name) |
| 36 | { |
| 37 | /* |
| 38 | * Some implementations don't error out, replicate this behavior for |
| 39 | * consistency. |
| 40 | */ |
| 41 | if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) { |
| 42 | return ERANGE; |
| 43 | } |
| 44 | |
| 45 | return pthread_setname_np(pthread_self(), name); |
| 46 | } |
| 47 | |
| 48 | static inline |
| 49 | int lttng_pthread_getname_np(char *name, size_t len) |
| 50 | { |
| 51 | return pthread_getname_np(pthread_self(), name, len); |
| 52 | } |
| 53 | #elif defined(HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID) |
| 54 | static inline |
| 55 | int lttng_pthread_setname_np(const char *name) |
| 56 | { |
| 57 | return pthread_setname_np(name); |
| 58 | } |
| 59 | |
| 60 | static inline |
| 61 | int lttng_pthread_getname_np(char *name, size_t len) |
| 62 | { |
| 63 | return pthread_getname_np(name, len); |
| 64 | } |
| 65 | #elif defined(HAVE_PTHREAD_SET_NAME_NP_WITH_TID) |
| 66 | |
| 67 | #include <pthread_np.h> |
| 68 | static inline |
| 69 | int lttng_pthread_setname_np(const char *name) |
| 70 | { |
| 71 | /* Replicate pthread_setname_np's behavior */ |
| 72 | if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) { |
| 73 | return ERANGE; |
| 74 | } |
| 75 | |
| 76 | pthread_set_name_np(pthread_self(), name); |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static inline |
| 81 | int lttng_pthread_getname_np(char *name, size_t len) |
| 82 | { |
| 83 | pthread_get_name_np(pthread_self(), name, len); |
| 84 | return 0; |
| 85 | } |
| 86 | #elif defined(__linux__) |
| 87 | |
| 88 | /* Fallback on prtctl on Linux */ |
| 89 | #include <sys/prctl.h> |
| 90 | |
| 91 | static inline |
| 92 | int lttng_pthread_setname_np(const char *name) |
| 93 | { |
| 94 | /* Replicate pthread_setname_np's behavior */ |
| 95 | if (strnlen(name, LTTNG_UST_ABI_PROCNAME_LEN) >= LTTNG_UST_ABI_PROCNAME_LEN) { |
| 96 | return ERANGE; |
| 97 | } |
| 98 | return prctl(PR_SET_NAME, name, 0, 0, 0); |
| 99 | } |
| 100 | |
| 101 | static inline |
| 102 | int lttng_pthread_getname_np(char *name, size_t len) |
| 103 | { |
| 104 | return prctl(PR_GET_NAME, name, 0, 0, 0); |
| 105 | } |
| 106 | |
| 107 | #else |
| 108 | #error "Please add pthread name support for your OS." |
| 109 | #endif |
| 110 | |
| 111 | /* |
| 112 | * If a pthread setname/set_name function is available, declare |
| 113 | * the setustprocname() function that will add '-ust' to the end |
| 114 | * of the current process name, while truncating it if needed. |
| 115 | */ |
| 116 | static inline |
| 117 | int lttng_ust_setustprocname(void) |
| 118 | { |
| 119 | int ret = 0, len; |
| 120 | char name[LTTNG_UST_ABI_PROCNAME_LEN]; |
| 121 | int limit = LTTNG_UST_ABI_PROCNAME_LEN - strlen(LTTNG_UST_PROCNAME_SUFFIX) - 1; |
| 122 | |
| 123 | /* |
| 124 | * Get the current thread name. |
| 125 | */ |
| 126 | ret = lttng_pthread_getname_np(name, LTTNG_UST_ABI_PROCNAME_LEN); |
| 127 | if (ret) { |
| 128 | goto error; |
| 129 | } |
| 130 | |
| 131 | len = strlen(name); |
| 132 | if (len > limit) { |
| 133 | len = limit; |
| 134 | } |
| 135 | |
| 136 | ret = sprintf(name + len, LTTNG_UST_PROCNAME_SUFFIX); |
| 137 | if (ret != strlen(LTTNG_UST_PROCNAME_SUFFIX)) { |
| 138 | goto error; |
| 139 | } |
| 140 | |
| 141 | ret = lttng_pthread_setname_np(name); |
| 142 | |
| 143 | error: |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | #include <errno.h> |
| 148 | |
| 149 | #ifndef ENODATA |
| 150 | #define ENODATA ENOMSG |
| 151 | #endif |
| 152 | |
| 153 | #endif /* _UST_COMPAT_H */ |