Provided by: libexplain-dev_1.4.D001-7_amd64 bug

NAME

       explain_uname - explain uname(2) errors

SYNOPSIS

       #include <libexplain/uname.h>
       const char *explain_uname(struct utsname *data);
       const char *explain_errno_uname(int errnum, struct utsname *data);
       void explain_message_uname(char *message, int message_size, struct utsname *data);
       void explain_message_errno_uname(char *message, int message_size, int errnum, struct
       utsname *data);

DESCRIPTION

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

   explain_uname
       const char *explain_uname(struct utsname *data);

       The  explain_uname  function  is used to obtain an explanation of an error returned by the
       uname(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.

       data    The original data, exactly as passed to the uname(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.

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

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

   explain_errno_uname
       const char *explain_errno_uname(int errnum, struct utsname *data);

       The explain_errno_uname function is used to obtain an explanation of an error returned  by
       the   uname(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.

       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.

       data    The original data, exactly as passed to the uname(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.

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

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

   explain_message_uname
       void explain_message_uname(char *message, int message_size, struct utsname *data);

       The  explain_message_uname  function is used to obtain an explanation of an error returned
       by the uname(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.

       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.

       data    The original data, exactly as passed to the uname(2) system call.

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

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

   explain_message_errno_uname
       void explain_message_errno_uname(char *message, int message_size, int errnum, struct
       utsname *data);

       The  explain_message_errno_uname  function  is  used  to obtain an explanation of an error
       returned by the uname(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.

       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.

       data    The original data, exactly as passed to the uname(2) system call.

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

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

SEE ALSO

       uname(2)
               get name and information about current kernel

       explain_uname_or_die(3)
               get name and information about current kernel and report errors

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2013 Peter Miller

                                                                                 explain_uname(3)