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Man Pages


Manual Reference Pages  -  EXPLAIN_GETADDRINFO (3)

NAME

explain_getaddrinfo - explain getaddrinfo(3) errors

CONTENTS

Synopsis
Description
See Also
Copyright

SYNOPSIS

#include <libexplain/getaddrinfo.h>

const char *explain_errcode_getaddrinfo(int errnum, const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res);
void explain_message_errcode_getaddrinfo(char *message, int message_size, int errnum, const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res);

DESCRIPTION

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

    explain_errcode_getaddrinfo

const char *explain_errcode_getaddrinfo(int errnum, const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res);

The B]explain_errcode_getaddrinfo function is used to obtain an explanation of an error returned by the I]getaddrinfo(3) system call. The least the message will contain is the value of CW]gai_strerror(errcode), 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:

int errcode = getaddrinfo(node, service, hints, res);
if (errncode == GAI_SYSTEM)
    errcode = errno;
if (errcode)
{
    fprintf(stderr, "%s\n", explain_errcode_getaddrinfo(errcode,
        node, service, hints, res));
    exit(EXIT_FAILURE);
}

The above code example is available as the I]explain_getaddrinfo_or_die(3) function.
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]node The original node, exactly as passed to the I]getaddrinfo(3) system call.
I]service
  The original service, exactly as passed to the I]getaddrinfo(3) system call.
I]hints The original hints, exactly as passed to the I]getaddrinfo(3) system call.
I]res The original res, exactly as passed to the I]getaddrinfo(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.
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_errno_getaddrinfo

void explain_message_errno_getaddrinfo(char *message, int message_size, int errnum, const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res);

The B]explain_message_errno_getaddrinfo function may be used to obtain an explanation of an error returned by the I]getaddrinfo(3) 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:

int errcode = getaddrinfo(node, service, hints, res);
if (errnode == EAI_SYSTEM)
    errcode = errno;
if (errcode)
{
    char message[3000];
    explain_message_errcode_getaddrinfo(message, sizeof(message),
        errcode, node, service, hints, res);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

The above code example is available pre[hy]packaged as the I]explain_getaddrinfo_or_die(3) function.
I]message
  The location in which to store the returned message. If a suitable message return buffer is 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]node The original node, exactly as passed to the I]getaddrinfo(3) system call.
I]service
  The original service, exactly as passed to the I]getaddrinfo(3) system call.
I]hints The original hints, exactly as passed to the I]getaddrinfo(3) system call.
I]res The original res, exactly as passed to the I]getaddrinfo(3) system call.

SEE ALSO

I]getaddrinfo(3)
  network address and
I]explain_getaddrinfo_or_die(3)
  network address and and report errors

COPYRIGHT

libexplain version 1.3
Copyright © 2008 Peter Miller
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