Provided by: libexplain-dev_1.4.D001-12_amd64 bug

NAME

       explain_connect - explain connect(2) errors

SYNOPSIS

       #include <libexplain/connect.h>
       const   char   *explain_connect(int   fildes,   const   struct  sockaddr  *serv_addr,  int
       serv_addr_size);
       const  char  *explain_errno_connect(int  errnum,  int  fildes,   const   struct   sockaddr
       *serv_addr, int serv_addr_size);
       void  explain_message_connect(char  *message,  int  message_size, int fildes, const struct
       sockaddr *serv_addr, int serv_addr_size);
       void  explain_message_errno_connect(char  *message,  int  message_size,  int  errnum,  int
       fildes, const struct sockaddr *serv_addr, int serv_addr_size);

DESCRIPTION

       These  functions  may be used to obtain explanations for errors returned by the connect(2)
       system call.

   explain_connect
       const  char  *explain_connect(int  fildes,   const   struct   sockaddr   *serv_addr,   int
       serv_addr_size);

       The  explain_connect function is used to obtain an explanation of an error returned by the
       connect(2)  system  call.   The  least  the  message  will  contain  is   the   value   of
       strerror(errno),  but usually it will do much better, and indicate the underlying cause in
       more detail.

       The errno global variable will be used to obtain the error value to be decoded.

       This function is intended to be used in a fashion similar to the following example:
              if (connect(fildes, serv_addr, serv_addr_size) < 0)
              {
                  fprintf(stderr, "%s\n", explain_connect(fildes, serv_addr,
                      serv_addr_size));
                  exit(EXIT_FAILURE);
              }

       fildes  The original fildes, exactly as passed to the connect(2) system call.

       serv_addr
               The original serv_addr, exactly as passed to the connect(2) system call.

       serv_addr_size
               The original serv_addr_size, exactly as passed to the connect(2) system call.

       Returns:
               The message explaining the error.  This message buffer is shared by all libexplain
               functions  which  do  not  supply  a  buffer in their argument list.  This will be
               overwritten by the next call to any libexplain function which shares this  buffer,
               including other threads.

       Note:  This  function  is  not  thread  safe, because it shares a return buffer across all
       threads, and many other functions in this library.

   explain_errno_connect
       const  char  *explain_errno_connect(int  errnum,  int  fildes,   const   struct   sockaddr
       *serv_addr, int serv_addr_size);

       The  explain_errno_connect  function is used to obtain an explanation of an error returned
       by the connect(2) system call.  The least  the  message  will  contain  is  the  value  of
       strerror(errnum), but usually it will do much better, and indicate the underlying cause in
       more detail.

       This function is intended to be used in a fashion similar to the following example:
              if (connect(fildes, serv_addr, serv_addr_size) < 0)
              {
                  int err = errno;
                  fprintf(stderr, "%s\n", explain_errno_connect(err,
                      fildes, serv_addr, serv_addr_size));
                  exit(EXIT_FAILURE);
              }

       errnum  The error value to be decoded, usually obtained from  the  errno  global  variable
               just  before  this  function is called.  This is necessary if you need to call any
               code between the system call to be explained and this function, because many  libc
               functions will alter the value of errno.

       fildes  The original fildes, exactly as passed to the connect(2) system call.

       serv_addr
               The original serv_addr, exactly as passed to the connect(2) system call.

       serv_addr_size
               The original serv_addr_size, exactly as passed to the connect(2) system call.

       Returns:
               The message explaining the error.  This message buffer is shared by all libexplain
               functions which do not supply a buffer in  their  argument  list.   This  will  be
               overwritten  by the next call to any libexplain function which shares this buffer,
               including other threads.

       Note: This function is not thread safe, because it  shares  a  return  buffer  across  all
       threads, and many other functions in this library.

   explain_message_connect
       void  explain_message_connect(char  *message,  int  message_size, int fildes, const struct
       sockaddr *serv_addr, int serv_addr_size);

       The explain_message_connect function may be used to  obtain an  explanation  of  an  error
       returned  by  the connect(2) system call.  The least the message will contain is the value
       of strerror(errno), but usually it will do much better, and indicate the underlying  cause
       in more detail.

       The errno global variable will be used to obtain the error value to be decoded.

       This function is intended to be used in a fashion similar to the following example:
              if (connect(fildes, serv_addr, serv_addr_size) < 0)
              {
                  char message[3000];
                  explain_message_connect(message, sizeof(message),
                      fildes, serv_addr, serv_addr_size);
                  fprintf(stderr, "%s\n", message);
                  exit(EXIT_FAILURE);
              }

       message The location in which to store the returned message.  If a suitable message return
               buffer is supplied, this function is thread safe.

       message_size
               The size in bytes of the location in which to store the returned message.

       fildes  The original fildes, exactly as passed to the connect(2) system call.

       serv_addr
               The original serv_addr, exactly as passed to the connect(2) system call.

       serv_addr_size
               The original serv_addr_size, exactly as passed to the connect(2) system call.

   explain_message_errno_connect
       void  explain_message_errno_connect(char  *message,  int  message_size,  int  errnum,  int
       fildes, const struct sockaddr *serv_addr, int serv_addr_size);

       The  explain_message_errno_connect  function  may  be  used to obtain an explanation of an
       error returned by the connect(2) system call.  The least the message will contain  is  the
       value of strerror(errnum), but usually it will do much better, and indicate the underlying
       cause in more detail.

       This function is intended to be used in a fashion similar to the following example:
              if (connect(fildes, serv_addr, serv_addr_size) < 0)
              {
                  int err = errno;
                  char message[3000];
                  explain_message_errno_connect(message, sizeof(message), err,
                      fildes, serv_addr, serv_addr_size);
                  fprintf(stderr, "%s\n", message);
                  exit(EXIT_FAILURE);
              }

       message The location in which to store the returned message.  If a suitable message return
               buffer is supplied, this function is thread safe.

       message_size
               The size in bytes of the location in which to store the returned message.

       errnum  The  error  value  to  be decoded, usually obtained from the errno global variable
               just before this function is called.  This is necessary if you need  to  call  any
               code  between the system call to be explained and this function, because many libc
               functions will alter the value of errno.

       fildes  The original fildes, exactly as passed to the connect(2) system call.

       serv_addr
               The original serv_addr, exactly as passed to the connect(2) system call.

       serv_addr_size
               The original serv_addr_size, exactly as passed to the connect(2) system call.

SEE ALSO

       connect(2)
               initiate a connection on a socket

       explain_connect_or_die(3)
               initiate a connection on a socket and report errors

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2008 Peter Miller

                                                                               explain_connect(3)