lib/libc/ip/gai_strerror.c

   1 #include <errno.h>
   2 #include <netdb.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 /*
   7  * gai_strerror is based on
   8  * http://www.opengroup.org/onlinepubs/009695399/functions/gai_strerror.html
   9  */
  10 const char *gai_strerror(int ecode)
  11 {
  12         static char buffer[256];
  13
  14         /* check for each known error code */
  15         switch (ecode)
  16         {
  17                 case EAI_AGAIN:
  18                         return "The name could not be resolved at this time";
  19
  20                 case EAI_BADFLAGS:
  21                         return "The flags had an invalid value";
  22
  23                 case EAI_FAIL:
  24                         return "A non-recoverable error occurred";
  25
  26                 case EAI_FAMILY:
  27                         return "The address family was not recognized or the "
  28                                 "address length was invalid for the specified "
  29                                 "family";
  30
  31                 case EAI_MEMORY:
  32                         return "There was a memory allocation failure";
  33
  34                 case EAI_NONAME:
  35                         return "The name does not resolve for the supplied "
  36                                 "parameters, NI_NAMEREQD is set and the host's "
  37                                 "name cannot be located, or both nodename and "
  38                                 "servname were null";
  39
  40                 case EAI_SERVICE:
  41                         return "The service passed was not recognized for the "
  42                                 "specified socket type";
  43
  44                 case EAI_SOCKTYPE:
  45                         return "The intended socket type was not recognized";
  46
  47                 case EAI_SYSTEM:
  48                         snprintf(buffer,
  49                                 sizeof(buffer),
  50                                 "A system error occurred: %s",
  51                                 strerror(errno));
  52                         return buffer;
  53
  54                 case EAI_OVERFLOW:
  55                         return "An argument buffer overflowed";
  56         }
  57
  58         /* unknown error code */
  59         snprintf(buffer,
  60                 sizeof(buffer),
  61                 "An unknown error code was passed to gai_strerror: %d",
  62                 ecode);
  63         return buffer;
  64 }