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

NAME

       explain_acl_get_fd - explain acl_get_fd(3) errors

SYNOPSIS

       #include <libexplain/acl_get_fd.h>
       const char *explain_acl_get_fd(int fildes);
       const char *explain_errno_acl_get_fd(int errnum, int fildes);
       void explain_message_acl_get_fd(char *message, int message_size, int fildes);
       void explain_message_errno_acl_get_fd(char *message, int message_size, int errnum, int
       fildes);

DESCRIPTION

       These  functions  may  be  used  to  obtain  explanations  for  errors  returned  by   the
       acl_get_fd(3) system call.

   explain_acl_get_fd
       const char *explain_acl_get_fd(int fildes);

       The  explain_acl_get_fd  function is used to obtain an explanation of an error returned by
       the acl_get_fd(3) 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.

       fildes  The original fildes, exactly as passed to the acl_get_fd(3) 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.

       Example: This function is intended to be used  in  a  fashion  similar  to  the  following
       example:
              acl_t result = acl_get_fd(fildes);
              if (result < 0)
              {
                  fprintf(stderr, "%s\n", explain_acl_get_fd(fildes));
                  exit(EXIT_FAILURE);
              }

       The  above  code  example  is  available  pre-packaged as the explain_acl_get_fd_or_die(3)
       function.

   explain_errno_acl_get_fd
       const char *explain_errno_acl_get_fd(int errnum, int fildes);

       The explain_errno_acl_get_fd function is  used  to  obtain  an  explanation  of  an  error
       returned  by  the  acl_get_fd(3)  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.

       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 acl_get_fd(3) 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.

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

       The  above  code  example  is  available  pre-packaged as the explain_acl_get_fd_or_die(3)
       function.

   explain_message_acl_get_fd
       void explain_message_acl_get_fd(char *message, int message_size, int fildes);

       The explain_message_acl_get_fd function is used to  obtain  an  explanation  of  an  error
       returned  by  the  acl_get_fd(3)  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.

       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 acl_get_fd(3) system call.

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

       The  above  code  example  is  available  pre-packaged as the explain_acl_get_fd_or_die(3)
       function.

   explain_message_errno_acl_get_fd
       void explain_message_errno_acl_get_fd(char *message, int message_size, int errnum, int
       fildes);

       The explain_message_errno_acl_get_fd function is used to obtain an explanation of an error
       returned by the acl_get_fd(3) 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.

       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 acl_get_fd(3) system call.

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

       The  above  code  example  is  available  pre-packaged as the explain_acl_get_fd_or_die(3)
       function.

SEE ALSO

       acl_get_fd(3)
               Execute acl_get_fd(3)

       explain_acl_get_fd_or_die(3)
               Execute acl_get_fd(3) and report errors

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2013 Peter Miller

                                                                            explain_acl_get_fd(3)