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

NAME

       explain_mknod - explain mknod(2) errors

SYNOPSIS

       #include <libexplain/mknod.h>
       const char *explain_mknod(const char *pathname, mode_t mode, dev_t dev);
       const char *explain_errno_mknod(int errnum, const char *pathname, mode_t mode, dev_t dev);
       void explain_message_mknod(char *message, int message_size, const char *pathname, mode_t mode, dev_t
       dev);
       void explain_message_errno_mknod(char *message, int message_size, int errnum, const char *pathname,
       mode_t mode, dev_t dev);

DESCRIPTION

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

   explain_mknod
       const char *explain_mknod(const char *pathname, mode_t mode, dev_t dev);

       The  explain_mknod  function is used to obtain an explanation of an error returned by the mknod(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.

       pathname
               The original pathname, exactly as passed to the mknod(2) system call.

       mode    The original mode, exactly as passed to the mknod(2) system call.

       dev     The original dev, exactly as passed to the mknod(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 (mknod(pathname, mode, dev) < 0)
              {
                  fprintf(stderr, "%s\n", explain_mknod(pathname, mode, dev));
                  exit(EXIT_FAILURE);
              }

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

   explain_errno_mknod
       const char *explain_errno_mknod(int errnum, const char *pathname, mode_t mode, dev_t dev);

       The explain_errno_mknod function is used to obtain an explanation of an error returned  by  the  mknod(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.

       pathname
               The original pathname, exactly as passed to the mknod(2) system call.

       mode    The original mode, exactly as passed to the mknod(2) system call.

       dev     The original dev, exactly as passed to the mknod(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 (mknod(pathname, mode, dev) < 0)
              {
                  int err = errno;
                  fprintf(stderr, "%s\n", explain_errno_mknod(err, pathname, mode, dev));
                  exit(EXIT_FAILURE);
              }

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

   explain_message_mknod
       void explain_message_mknod(char *message, int message_size, const char *pathname, mode_t mode, dev_t
       dev);

       The explain_message_mknod function is used to obtain an explanation of an error returned by the  mknod(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.

       pathname
               The original pathname, exactly as passed to the mknod(2) system call.

       mode    The original mode, exactly as passed to the mknod(2) system call.

       dev     The original dev, exactly as passed to the mknod(2) system call.

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

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

   explain_message_errno_mknod
       void explain_message_errno_mknod(char *message, int message_size, int errnum, const char *pathname,
       mode_t mode, dev_t dev);

       The explain_message_errno_mknod function is used to obtain an explanation of an  error  returned  by  the
       mknod(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.

       pathname
               The original pathname, exactly as passed to the mknod(2) system call.

       mode    The original mode, exactly as passed to the mknod(2) system call.

       dev     The original dev, exactly as passed to the mknod(2) system call.

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

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

SEE ALSO

       mknod(2)
               create a special or ordinary file

       explain_mknod_or_die(3)
               create a special or ordinary file and report errors

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2009 Peter Miller

                                                                                                explain_mknod(3)