explain_getdomainname(3)

💖 explain_getdomainname — the girlies' guide to decoding getdomainname(2) errors 💖

okay so bestie, welcome to the Library Functions Manual ✨ this one is short, sweet, and honestly iconic — it's all about turning those cursed getdomainname(2) failures into actual readable explanations instead of just staring at errno like 👁️👄👁️

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🌸 NAME 🌸

explain_getdomainname — explain getdomainname(2) errors, no cap 💅

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🦋 SYNOPSIS 🦋

#include <libexplain/getdomainname.h>
const char *explain_getdomainname(char *data, size_t data_size);
const char *explain_errno_getdomainname(int errnum, char *data, size_t
data_size);
void explain_message_getdomainname(char *message, int message_size, char
*data, size_t data_size);
void explain_message_errno_getdomainname(char *message, int
message_size, int errnum, char *data, size_t data_size);

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✨ DESCRIPTION ✨

so like, these functions? they're the ones you call when the getdomainname(2) system call said "nope" 🙈 and you want an actual explanation instead of a cryptic number. That's the whole vibe. They hand you the receipts. 🧾

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🎀 explain_getdomainname 🎀

const char *explain_getdomainname(char *data, size_t data_size);

The explain_getdomainname function is your go-to for getting an explanation of an error returned by the getdomainname(2) system call. The least the message will contain is the value of strerror(errno), but usually it will do much better than that, and it'll point at the underlying cause in more detail. she ate. 💅

The errno global variable will be used to obtain the error value to be decoded.

• data — The original data, exactly as passed to the getdomainname(2) system call.
• data_size — The original data_size, exactly as passed to the getdomainname(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. like, she's got one outfit and everyone's fighting over it 😭

Example: This function is intended to be used in a fashion similar to the following example:

if (getdomainname(data, data_size) < 0)
{
    fprintf(stderr, "%s\n", explain_getdomainname(data,
    data_size));
    exit(EXIT_FAILURE);
}

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

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💜 explain_errno_getdomainname 💜

const char *explain_errno_getdomainname(int errnum, char *data, size_t
data_size);

The explain_errno_getdomainname function is used to obtain an explanation of an error returned by the getdomainname(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. lowkey a glow-up from the plain version ✨

• 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. (yes bestie, errno is that friend who changes personality depending on who she's with 💀)
• data — The original data, exactly as passed to the getdomainname(2) system call.
• data_size — The original data_size, exactly as passed to the getdomainname(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 (getdomainname(data, data_size) < 0)
{
    int err = errno;
    fprintf(stderr, "%s\n", explain_errno_getdomainname(err,
    data, data_size));
    exit(EXIT_FAILURE);
}

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

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🍓 explain_message_getdomainname 🍓

void explain_message_getdomainname(char *message, int message_size, char
*data, size_t data_size);

The explain_message_getdomainname function is used to obtain an explanation of an error returned by the getdomainname(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. (yes queen, you brought your own buffer, you brought your own peace 🧘‍♀️)
• 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 getdomainname(2) system call.
• data_size — The original data_size, exactly as passed to the getdomainname(2) system call.

Example: This function is intended to be used in a fashion similar to the following example:

if (getdomainname(data, data_size) < 0)
{
    char message[3000];
    explain_message_getdomainname(message, sizeof(message), data,
    data_size);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

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

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👑 explain_message_errno_getdomainname 👑

void explain_message_errno_getdomainname(char *message, int
message_size, int errnum, char *data, size_t data_size);

The explain_message_errno_getdomainname function is used to obtain an explanation of an error returned by the getdomainname(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. this is the final boss form fr fr 🔥

• 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 getdomainname(2) system call.
• data_size — The original data_size, exactly as passed to the getdomainname(2) system call.

Example: This function is intended to be used in a fashion similar to the following example:

if (getdomainname(data, data_size) < 0)
{
    int err = errno;
    char message[3000];
    explain_message_errno_getdomainname(message, sizeof(message),
    err, data, data_size);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

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

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🌟 SEE ALSO 🌟

• getdomainname(2) — get domain name
• explain_getdomainname_or_die(3) — get domain name and report errors

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💌 COPYRIGHT 💌

libexplain version 1.4 Copyright (C) 2009 Peter Miller

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okay that's the whole page bestie, and yeah — it's explain_getdomainname(3) from the Library Functions Manual, brought to you by libexplain version 1.4, copyright © 2009 Peter Miller, all wrapped up and slayed. go forth and decode those errors, you've got this 💅✨🦋