From cf3fc8a05c8e880b78ab380421557b5952d98c20 Mon Sep 17 00:00:00 2001
From: Aaron Merey <amerey@redhat.com>
Date: Mon, 3 Nov 2025 17:59:23 -0500
Subject: [PATCH] doc: Add gelf_update_ehdr.3

Signed-off-by: Aaron Merey <amerey@redhat.com>
---
 doc/Makefile.am        |  1 +
 doc/gelf_update_ehdr.3 | 78 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 doc/gelf_update_ehdr.3

diff --git a/doc/Makefile.am b/doc/Makefile.am
index af7f4097..b212266b 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -98,6 +98,7 @@ notrans_dist_man3_MANS= elf32_checksum.3 \
 			gelf_getshdr.3 \
 			gelf_newphdr.3 \
 			gelf_offscn.3 \
+			gelf_update_ehdr.3 \
 			gelf_update_shdr.3 \
 			libelf.3
 
diff --git a/doc/gelf_update_ehdr.3 b/doc/gelf_update_ehdr.3
new file mode 100644
index 00000000..4549595d
--- /dev/null
+++ b/doc/gelf_update_ehdr.3
@@ -0,0 +1,78 @@
+.TH GELF_UPDATE_EHDR 3 2025-09-17 "Libelf" "Libelf Programmer's Manual"
+
+.SH NAME
+gelf_update_ehdr \- copy a class\-independent ELF header into an ELF descriptor
+
+.SH SYNOPSIS
+.nf
+.B #include <gelf.h>
+
+.BI "int gelf_update_ehdr(Elf *" elf ", GElf_Ehdr *" src ");"
+.fi
+
+.SH DESCRIPTION
+.BR gelf_update_ehdr ()
+copies the class\-independent ELF header from the structure pointed to by
+.I src
+into the ELF descriptor
+.I elf .
+The header is translated as necessary to match the class (
+.B ELFCLASS32
+or
+.BR ELFCLASS64 )
+of the underlying object.
+
+If
+.I elf
+has class
+.B ELFCLASS32
+then
+.BR e_entry ,
+.B e_phoff
+and
+.B e_shoff
+must be expressible as 32-bit values.  This function also marks the Ehdr
+dirty (see
+.BR elf_flagehdr ()).
+
+.SH PARAMETERS
+.TP
+.I elf
+Pointer to an ELF descriptor of kind
+.BR ELF_K_ELF .
+
+.TP
+.I src
+Pointer to a
+.B GElf_Ehdr
+structure that holds the caller’s desired header contents. Must not be NULL.
+
+.SH RETURN VALUE
+On success,
+.BR gelf_update_ehdr ()
+returns a non-zero value.  On failure, it returns 0 and sets elf_errno.  If
+.I elf
+is NULL, then 0 is returned without setting elf_errno.
+
+.SH SEE ALSO
+.BR gelf_getehdr (3),
+.BR gelf_newehdr (3),
+.BR elf_flagehdr (3),
+.BR libelf (3),
+.BR elf (5)
+
+.SH ATTRIBUTES
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR gelf_update_ehdr ()
+T}	Thread safety	MT-Safe
+.TE
+
+.SH REPORTING BUGS
+Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.
-- 
2.47.3