explain_mktemp(3)

💖 explain_mktemp — bestie, let's decode ur mktemp(3) L's 💖

okay so real talk: this is the manual page for explain_mktemp(3) from the libexplain library, and it's genuinely the most helpful little group chat you could ever have when mktemp(3) decides to not work. it explains mktemp(3) errors. that's the whole vibe. let's go ✨

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🌸 NAME 🌸

explain_mktemp — explain mktemp(3) errors 🫶

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✨ SYNOPSIS ✨

#include <libexplain/mktemp.h>
const char *explain_mktemp(char *pathname);
const char *explain_errno_mktemp(int errnum, char *pathname);
void explain_message_mktemp(char *message, int message_size, char
*pathname);
void explain_message_errno_mktemp(char *message, int message_size, int
errnum, char *pathname);

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💅 DESCRIPTION 💅

so these functions? they're the ones you call to get actual explanations for errors that came back from the mktemp(3) system call. not just a sad little number, an actual explanation. no cap.

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🎀 explain_mktemp 🎀

const char *explain_mktemp(char *pathname);

the explain_mktemp function is how you get an explanation of an error returned by the mktemp(3) system call. the least the message will contain is the value of strerror(errno), but usually it does so much better than that and points at the underlying cause in way more detail. it's giving detective energy 🔍

the errno global variable is what gets used to obtain the error value to be decoded.

• pathname — the original pathname, exactly as passed to the mktemp(3) system call. literally character for character, don't get cute with it.

Returns: the message explaining the error. ⚠️ this message buffer is shared by all libexplain functions that don't supply a buffer in their argument list. it will get overwritten by the next call to any libexplain function that shares this buffer, including calls from other threads. so if you need it later, copy it, bestie.

Note: this function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library do too. 💀

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

char *result = mktemp(pathname);
if (!result)
{
    fprintf(stderr, "%s\n", explain_mktemp(pathname));
    exit(EXIT_FAILURE);
}

the above code example is available pre‐packaged as the explain_mktemp_or_die(3) function. iconic, honestly 👑

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🦋 explain_errno_mktemp 🦋

const char *explain_errno_mktemp(int errnum, char *pathname);

the explain_errno_mktemp function is how you get an explanation of an error returned by the mktemp(3) system call. the least the message will contain is the value of strerror(errno), but usually it does much better and indicates the underlying cause in more detail.

• errnum — the error value to be decoded, usually grabbed from the errno global variable right before this function is called. this is necessary if you need to run any code between the system call being explained and this function, because so many libc functions will alter the value of errno. like they just wander in and mess with it. rude. 🙈
• pathname — the original pathname, exactly as passed to the mktemp(3) system call.

Returns: the message explaining the error. ⚠️ this message buffer is shared by all libexplain functions that don't supply a buffer in their argument list. it will be overwritten by the next call to any libexplain function that 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:

char *result = mktemp(pathname);
if (!result)
{
    int err = errno;
    fprintf(stderr, "%s\n", explain_errno_mktemp(err, pathname));
    exit(EXIT_FAILURE);
}

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

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🌈 explain_message_mktemp 🌈

void explain_message_mktemp(char *message, int message_size, char
*pathname);

the explain_message_mktemp function is how you get an explanation of an error returned by the mktemp(3) system call. the least the message will contain is the value of strerror(errno), but usually it does much better and indicates the underlying cause in more detail.

the errno global variable is what gets 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. slay, you brought your own buffer 🫶
• 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 mktemp(3) system call.

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

char *result = mktemp(pathname);
if (!result)
{
    char message[3000];
    explain_message_mktemp(message, sizeof(message), pathname);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

the above code example is available pre‐packaged as the explain_mktemp_or_die(3) function. ✨

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🧚 explain_message_errno_mktemp 🧚

void explain_message_errno_mktemp(char *message, int message_size, int
errnum, char *pathname);

the explain_message_errno_mktemp function is how you get an explanation of an error returned by the mktemp(3) system call. the least the message will contain is the value of strerror(errno), but usually it does much better and indicates 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 mktemp(3) system call.

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

char *result = mktemp(pathname);
if (!result)
{
    int err = errno;
    char message[3000];
    explain_message_errno_mktemp(message, sizeof(message), err,
    pathname);
    fprintf(stderr, "%s\n", message);
    exit(EXIT_FAILURE);
}

the above code example is available pre‐packaged as the explain_mktemp_or_die(3) function. 💜

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👑 SEE ALSO 👑

• mktemp(3) — make a unique temporary filename
• explain_mktemp_or_die(3) — make a unique temporary filename and report errors

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🍓 COPYRIGHT 🍓

libexplain version 1.4 Copyright (C) 2010 Peter Miller

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and that's the whole page bestie, go forth and mktemp responsibly 💅🌸 this was explain_mktemp(3) from the Library Functions Manual — libexplain version 1.4, © 2010 Peter Miller, and yes the date energy is giving timeless. mwah 🫶✨