src/lib/lttng-ust/strerror.c

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   5  * Copyright (C) 2011-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  */
   7
   8 #include <lttng/ust-error.h>
   9
  10 #define CODE_OFFSET(code)       \
  11         (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1))
  12
  13 /*
  14  * Human readable error message.
  15  */
  16 static const char *ustcomm_readable_code[] = {
  17         [ CODE_OFFSET(LTTNG_UST_OK) ] = "Success",
  18         [ CODE_OFFSET(LTTNG_UST_ERR) ] = "Unknown error",
  19         [ CODE_OFFSET(LTTNG_UST_ERR_NOENT) ] = "No entry",
  20         [ CODE_OFFSET(LTTNG_UST_ERR_EXIST) ] = "Object already exists",
  21         [ CODE_OFFSET(LTTNG_UST_ERR_INVAL) ] = "Invalid argument",
  22         [ CODE_OFFSET(LTTNG_UST_ERR_PERM) ] = "Permission denied",
  23         [ CODE_OFFSET(LTTNG_UST_ERR_NOSYS) ] = "Not implemented",
  24         [ CODE_OFFSET(LTTNG_UST_ERR_EXITING) ] = "Process is exiting",
  25
  26         [ CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC) ] = "Invalid magic number",
  27         [ CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE) ] = "Invalid socket type",
  28         [ CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR) ] = "Unsupported major version",
  29         [ CODE_OFFSET(LTTNG_UST_ERR_PEERCRED) ] = "Cannot get unix socket peer credentials",
  30         [ CODE_OFFSET(LTTNG_UST_ERR_PEERCRED_PID) ] = "Peer credentials PID is invalid. Socket appears to belong to a distinct, non-nested pid namespace.",
  31 };
  32
  33 /*
  34  * lttng_ust_strerror
  35  * @code: must be a negative value of enum lttng_ust_error_code (or 0).
  36  *
  37  * Returns a ptr to a string representing a human readable error code from the
  38  * ustcomm_return_code enum.
  39  */
  40 const char *lttng_ust_strerror(int code)
  41 {
  42         code = -code;
  43
  44         if (code < LTTNG_UST_OK || code >= LTTNG_UST_ERR_NR)
  45                 code = LTTNG_UST_ERR;
  46
  47         return ustcomm_readable_code[CODE_OFFSET(code)];
  48 }