GETSEGBYNAME(3)

📦 version 1010.6, in nixpkgs unstable

💖 NAME 💖

okay bestie, welcome to getsegbyname(3) from the Library Functions Manual 💅 this one is all about getting the segment command for the named segment — iconic behavior, honestly ✨

✨ SYNOPSIS ✨

#include <mach-o/getsect.h>

const struct segment_command *getsegbyname(const char *segname);

🦋 DESCRIPTION 🦋

So here's the tea: this routine returns the segment_command structure for the named segment if it exists in the Mach-O (Mach object) executable that getsegbyname(3) is linked into. Slay. Otherwise, getsegbyname(3) returns NULL. No cap.

It uses the link editor defined symbol _mh_execute_header and just looks through the load commands. Since these are mapped into the __TEXT segment, they are read-only and thus const by default — very demure, very mindful 🎀

bestie, heads up: if this is to be used in executables linked with -pie, then the value return by the call to _dyld_get_image_vmaddr_slide(0) will need to be added to the vmaddr field of the segment_command struct. don't forget, or it's giving bug energy 😭

🌈 SEE ALSO 🌈

Go give these icons a read: end(3), getsectbyname(3) 🫶

mwah 💖 — Apple, Inc., October 3, 2008, on the GETSEGBYNAME(3) page. bye bestie, go get that segment command! 🎀

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