kstrtoll(9)

🌸 NAME 🌸

okay so bestie, this is kstrtoll(9) from the Kernel API Manual — and it’s literally here to convert a string to a long long ✨

✨ SYNOPSIS ✨

int kstrtoll (const char *s , unsigned int base , long long *res );

🎀 ARGUMENTS 🎀

• s — the start of the string, bestie. The string must be null-terminated, and it may also include a single newline before its terminating null. The first character may also be a plus sign or a minus sign 💅
• base — the number base to use. The maximum supported base is 16. If base is given as 0, then the base of the string is automatically detected with the conventional semantics — if it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it will be parsed as an octal number. Otherwise it will be parsed as a decimal 🧚
• res — where to write the result of the conversion on success 🫶

💅 DESCRIPTION 💅

Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. It’s preferred over simple_strtoll. The return code must be checked 👑

not me emphasizing this again: check the return code, fr fr 😭

🦋 SEE ALSO 🦋

Kernel file ./lib/kstrtox.c:

• _parse_integer_limit(9)
• kstrtoull(9)
• kstrtouint(9)
• kstrtoint(9)
• kstrtobool(9)
• kstrtoudec64(9)
• kstrtodec64(9)

sourced from ./lib, dated October 2026, and this iconic lil page is kstrtoll(9) — slay and bye bestie 💖🎀🦋