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Man Pages


Manual Reference Pages  -  EXPLAIN_FCHDIR (3)

NAME

explain_fchdir - explain fchdir(2) errors

CONTENTS

Synopsis
Description
Copyright
Author

SYNOPSIS

#include <libexplain/fchdir.h>
const char *explain_fchdir(int fildes);
void explain_message_fchdir(char *message, int message_size, int fildes);
const char *explain_errno_fchdir(int errnum, int fildes);
void explain_message_errno_fchdir(char *message, int message_size, int errnum, int fildes);

DESCRIPTION

These functions may be used to obtain explanations for I]fchdir(2) errors.

    explain_fchdir

const char *explain_fchdir(int fildes);

The explain_fchdir function is used to obtain an explanation of an error returned by the I]fchdir(2) system call. The least the message will contain is the value of CW]strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail.

The I]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 (fchdir(fildes) < 0)
{
    fprintf(stderr, ’%s0, explain_fchdir(fildes));
    exit(EXIT_FAILURE);
}

I]fildes The original fildes, exactly as passed to the I]fchdir(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.
B]Note: This function is B]not thread safe, because it shares a return buffer across all threads, and many other functions in this library.

    explain_errno_fchdir

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

The explain_errno_fchdir function is used to obtain an explanation of an error returned by the I]fchdir(2) system call. The least the message will contain is the value of CW]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 (fchdir(fildes) < 0)
{
    int err = errno;
    fprintf(stderr, ’%s0, explain_errno_fchdir(err, fildes));
    exit(EXIT_FAILURE);
}

I]errnum The error value to be decoded, usually obtained from the I]errno global variable just before this function is called. This is necessary if you need to call B]any code between the system call to be explained and this function, because many libc functions will alter the value of I]errno.
I]fildes The original fildes, exactly as passed to the I]fchdir(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.
B]Note: This function is B]not thread safe, because it shares a return buffer across all threads, and many other functions in this library.

    explain_message_fchdir

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

The explain_message_fchdir function is used to obtain an explanation of an error returned by the I]fchdir(2) system call. The least the message will contain is the value of CW]strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail.

The I]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 (fchdir(fildes) < 0)
{
    char message[3000];
    explain_message_fchdir(message, sizeof(message), fildes);
    fprintf(stderr, ’%s0, message);
    exit(EXIT_FAILURE);
}

I]message
  The location in which to store the returned message. Because a message return buffer has been supplied, this function is thread safe.
I]message_size
  The size in bytes of the location in which to store the returned message.
I]fildes The original fildes, exactly as passed to the I]fchdir(2) system call.

    explain_message_errno_fchdir

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

The explain_message_errno_fchdir function is used to obtain an explanation of an error returned by the I]fchdir(2) system call. The least the message will contain is the value of CW]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 (fchdir(fildes) < 0)
{
    int err = errno;
    char message[3000];
    explain_message_errno_fchdir(message, sizeof(message), err,
        fildes);
    fprintf(stderr, ’%s0, message);
    exit(EXIT_FAILURE);
}

I]message
  The location in which to store the returned message. Because a message return buffer has been supplied, this function is thread safe.
I]message_size
  The size in bytes of the location in which to store the returned message.
I]errnum The error value to be decoded, usually obtained from the I]errno global variable just before this function is called. This is necessary if you need to call B]any code between the system call to be explained and this function, because many libc functions will alter the value of I]errno.
I]fildes The original fildes, exactly as passed to the I]fchdir(2) system call.

COPYRIGHT

libexplain version 1.3
Copyright © 2008 Peter Miller

AUTHOR

Written by Peter Miller <pmiller@opensource.org.au>
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