liblttng-ust/compat.h

   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 Raphaël 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
  27 #include <lttng/ust-abi.h>
  28
  29 #define LTTNG_UST_PROCNAME_SUFFIX "-ust"
  30
  31
  32 #if defined(HAVE_PTHREAD_SETNAME_NP_WITH_TID)
  33 static inline
  34 int lttng_pthread_setname_np(const char *name)
  35 {
  36         return pthread_setname_np(pthread_self(), name);
  37 }
  38
  39 static inline
  40 int lttng_pthread_getname_np(char *name, size_t len)
  41 {
  42         return pthread_getname_np(pthread_self(), name, len);
  43 }
  44 #elif defined(HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID)
  45 static inline
  46 int lttng_pthread_setname_np(const char *name)
  47 {
  48         return pthread_setname_np(name);
  49 }
  50
  51 static inline
  52 int lttng_pthread_getname_np(char *name, size_t len)
  53 {
  54         return pthread_getname_np(name, len);
  55 }
  56 #elif defined(HAVE_PTHREAD_SET_NAME_NP_WITH_TID)
  57
  58 #include <pthread_np.h>
  59 static inline
  60 int lttng_pthread_setname_np(const char *name)
  61 {
  62         pthread_set_name_np(pthread_self(), name);
  63         return 0;
  64 }
  65
  66 static inline
  67 int lttng_pthread_getname_np(char *name, size_t len)
  68 {
  69         pthread_get_name_np(pthread_self(), name, len);
  70         return 0;
  71 }
  72 #elif defined(__linux__)
  73
  74 /* Fallback on prtctl on Linux */
  75 #include <sys/prctl.h>
  76
  77 static inline
  78 int lttng_pthread_setname_np(const char *name)
  79 {
  80         return prctl(PR_SET_NAME, name, 0, 0, 0);
  81 }
  82
  83 static inline
  84 int lttng_pthread_getname_np(char *name, size_t len)
  85 {
  86         return prctl(PR_GET_NAME, name, 0, 0, 0);
  87 }
  88
  89 #else
  90 #error "Please add pthread name support for your OS."
  91 #endif
  92
  93 /*
  94  * If a pthread setname/set_name function is available, declare
  95  * the setustprocname() function that will add '-ust' to the end
  96  * of the current process name, while truncating it if needed.
  97  */
  98 static inline
  99 int lttng_ust_setustprocname(void)
 100 {
 101         int ret = 0, len;
 102         char name[LTTNG_UST_ABI_PROCNAME_LEN];
 103         int limit = LTTNG_UST_ABI_PROCNAME_LEN - strlen(LTTNG_UST_PROCNAME_SUFFIX) - 1;
 104
 105         /*
 106          * Get the current thread name.
 107          */
 108         ret = lttng_pthread_getname_np(name, LTTNG_UST_ABI_PROCNAME_LEN);
 109         if (ret) {
 110                 goto error;
 111         }
 112
 113         len = strlen(name);
 114         if (len > limit) {
 115                 len = limit;
 116         }
 117
 118         ret = sprintf(name + len, LTTNG_UST_PROCNAME_SUFFIX);
 119         if (ret != strlen(LTTNG_UST_PROCNAME_SUFFIX)) {
 120                 goto error;
 121         }
 122
 123         ret = lttng_pthread_setname_np(name);
 124
 125 error:
 126         return ret;
 127 }
 128
 129 #include <errno.h>
 130
 131 #ifndef ENODATA
 132 #define ENODATA ENOMSG
 133 #endif
 134
 135 #endif /* _UST_COMPAT_H */