Provided by: libexplain-dev_1.4.D001-8_amd64 bug

NAME

       explain_pathconf - explain pathconf(3) errors

SYNOPSIS

       #include <libexplain/pathconf.h>
       const char *explain_pathconf(const char *pathname, int name);
       const char *explain_errno_pathconf(int errnum, const char *pathname, int name);
       void  explain_message_pathconf(char  *message, int message_size, const char *pathname, int
       name);
       void explain_message_errno_pathconf(char *message, int  message_size,  int  errnum,  const
       char *pathname, int name);

DESCRIPTION

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

   explain_pathconf
       const char *explain_pathconf(const char *pathname, int name);

       The explain_pathconf function is used to obtain an explanation of an error returned by the
       pathconf(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.

       This function is intended to be used in a fashion similar to the following example:
              if (pathconf(pathname, name) < 0)
              {
                  fprintf(stderr, "%s\n", explain_pathconf(pathname, name));
                  exit(EXIT_FAILURE);
              }

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

       pathname
               The original pathname, exactly as passed to the pathconf(3) system call.

       name    The original name, exactly as passed to the pathconf(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.

   explain_errno_pathconf
       const char *explain_errno_pathconf(int errnum, const char *pathname, int name);

       The explain_errno_pathconf function is used to obtain an explanation of an error  returned
       by  the  pathconf(3)  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 (pathconf(pathname, name) < 0)
              {
                  int err = errno;
                  fprintf(stderr, "%s\n", explain_errno_pathconf(err, pathname, name));
                  exit(EXIT_FAILURE);
              }

       The  above  code  example  is  available  pre‐packaged  as  the explain_pathconf_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.

       pathname
               The original pathname, exactly as passed to the pathconf(3) system call.

       name    The original name, exactly as passed to the pathconf(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.

   explain_message_pathconf
       void  explain_message_pathconf(char  *message, int message_size, const char *pathname, int
       name);

       The explain_message_pathconf function may be used to  obtain an explanation  of  an  error
       returned  by the pathconf(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.

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

       The  above  code  example  is  available  pre‐packaged  as  the explain_pathconf_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.

       pathname
               The original pathname, exactly as passed to the pathconf(3) system call.

       name    The original name, exactly as passed to the pathconf(3) system call.

   explain_message_errno_pathconf
       void  explain_message_errno_pathconf(char  *message,  int  message_size, int errnum, const
       char *pathname, int name);

       The explain_message_errno_pathconf function may be used to obtain  an  explanation  of  an
       error  returned by the pathconf(3) 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 (pathconf(pathname, name) < 0)
              {
                  int err = errno;
                  char message[3000];
                  explain_message_errno_pathconf(message, sizeof(message), err,
                      pathname, name);
                  fprintf(stderr, "%s\n", message);
                  exit(EXIT_FAILURE);
              }

       The  above  code  example  is  available  pre‐packaged  as  the explain_pathconf_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.

       pathname
               The original pathname, exactly as passed to the pathconf(3) system call.

       name    The original name, exactly as passed to the pathconf(3) system call.

SEE ALSO

       pathconf(3)
               get configuration values for files

       explain_pathconf_or_die(3)
               get configuration values for files and report errors

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2008 Peter Miller

                                                                              explain_pathconf(3)