Provided by: explain_0.52.D002-1_amd64 bug

NAME

       explain_accept - explain accept(2) errors

SYNOPSIS

       #include <libexplain/accept.h>
       const   char   *explain_accept(int   fildes,   struct   sockaddr   *sock_addr,   socklen_t
       *sock_addr_size);
       const char *explain_errno_accept(int  errnum,  int  fildes,  struct  sockaddr  *sock_addr,
       socklen_t *sock_addr_size);
       void  explain_message_accept(char  *message, int message_size, int fildes, struct sockaddr
       *sock_addr, socklen_t *sock_addrlen);
       void explain_message_errno_accept(char *message, int message_size, int errnum, int fildes,
       struct sockaddr *sock_addr, socklen_t *sock_addr_size);

DESCRIPTION

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

   explain_accept
       const   char   *explain_accept(int   fildes,   struct   sockaddr   *sock_addr,   socklen_t
       *sock_addr_size);

       The  explain_accept  function is used to obtain an explanation of an error returned by the
       accept(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 (accept(fildes, sock_addr, sock_addr_size) < 0)
              {
                  fprintf(stderr, "%s\n", explain_accept(fildes, sock_addr,
                      sock_addr_size));
                  exit(EXIT_FAILURE);
              }

       The above code example is available pre‐packaged as the explain_accept_or_die(3) function.

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

       sock_addr
               The original sock_addr, exactly as passed to the accept(2) system call.

       sock_addr_size
               The original sock_addr_size, exactly as passed to the accept(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_accept
       const char *explain_errno_accept(int  errnum,  int  fildes,  struct  sockaddr  *sock_addr,
       socklen_t *sock_addr_size);

       The explain_errno_accept function is used to obtain an explanation of an error returned by
       the accept(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 (accept(fildes, sock_addr, sock_addr_size) < 0)
              {
                  int err = errno;
                  fprintf(stderr, "%s\n", explain_errno_accept(err, fildes, sock_addr,
                      sock_addr_size));
                  exit(EXIT_FAILURE);
              }

       The above code example is available pre‐packaged as the explain_accept_or_die(3) function.

       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 accept(2) system call.

       sock_addr
               The original sock_addr, exactly as passed to the accept(2) system call.

       sock_addr_size
               The original sock_addr_size, exactly as passed to the accept(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_accept
       void  explain_message_accept(char  *message, int message_size, int fildes, struct sockaddr
       *sock_addr, socklen_t *sock_addr_size);

       The explain_message_accept function may be used to  obtain  an  explanation  of  an  error
       returned by the accept(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 (accept(fildes, sock_addr, sock_addr_size) < 0)
              {
                  char message[3000];
                  explain_message_accept(message, sizeof(message), fildes, sock_addr,
                      sock_addr_size);
                  fprintf(stderr, "%s\n", message);
                  exit(EXIT_FAILURE);
              }

       The above code example is available pre‐packaged as the explain_accept_or_die(3) function.

       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 accept(2) system call.

       sock_addr
               The original sock_addr, exactly as passed to the accept(2) system call.

       sock_addr_size
               The original sock_addr_size, exactly as passed to the accept(2) system call.

   explain_message_errno_accept
       void explain_message_errno_accept(char *message, int message_size, int errnum, int fildes,
       struct sockaddr *sock_addr, socklen_t *sock_addr_size);

       The explain_message_errno_accept function may be used to obtain an explanation of an error
       returned by the accept(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 (accept(fildes, sock_addr, sock_addr_size) < 0)
              {
                  int err = errno;
                  char message[3000];
                  explain_message_errno_accept(message, sizeof(message), err, fildes,
                      sock_addr, sock_addr_size);
                  fprintf(stderr, "%s\n", message);
                  exit(EXIT_FAILURE);
              }

       The above code example is available pre‐packaged as the explain_accept_or_die(3) function.

       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 accept(2) system call.

       sock_addr
               The original sock_addr, exactly as passed to the accept(2) system call.

       sock_addr_size
               The original sock_addr_size, exactly as passed to the accept(2) system call.

SEE ALSO

       accept(2)
               accept a connection on a socket

       explain_accept_or_die(3)
               accept a connection on a socket and report errors

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2008 Peter Miller

                                                                                explain_accept(3)