[PATCH] Add man pages for some libelf functions

[Aaron Merey <amerey@redhat.com>]

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Hi,

I've attached a patch that adds man pages for a few libelf functions.
These man pages were originally generated using ChatGPT (model
GPT-4o).  I edited each man page by hand to help ensure brevity and
accuracy.

Parts of the original descriptions generated by ChatGPT have been left
as is.  I've attached the original man pages generated by ChatGPT for
comparison.

The prompt used to generate the man pages was:
  Write a linux man page for the function called <FUNCTION> in the open
  source project called elfutils.

My goal is to eventually add man pages for all elfutils library functions.
If the man pages in this patch are acceptable then I will use the above
method to create the remaining man pages.  I will post these to
elfutils-devel in batches to avoid the need for reviewing very large
individual patches.

Aaron

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From 920a9ac8875d82e8014bf5f3afa6d85dbf00b6cb Mon Sep 17 00:00:00 2001
From: Aaron Merey <amerey@redhat.com>
Date: Thu, 13 Jun 2024 15:20:03 -0400
Subject: [PATCH] Add man pages for some libelf functions

Add man pages for elf32_getehdr.3, elf64_getehdr.3, elf_errmsg.3,
elf_errno.3 and elf_version.3

Signed-off-by: Aaron Merey <amerey@redhat.com>
---
 doc/Makefile.am     |  6 +++++-
 doc/elf32_getehdr.3 | 36 ++++++++++++++++++++++++++++++++++++
 doc/elf64_getehdr.3 | 36 ++++++++++++++++++++++++++++++++++++
 doc/elf_errmsg.3    | 26 ++++++++++++++++++++++++++
 doc/elf_errno.3     | 24 ++++++++++++++++++++++++
 doc/elf_version.3   | 23 +++++++++++++++++++++++
 6 files changed, 150 insertions(+), 1 deletion(-)
 create mode 100644 doc/elf32_getehdr.3
 create mode 100644 doc/elf64_getehdr.3
 create mode 100644 doc/elf_errmsg.3
 create mode 100644 doc/elf_errno.3
 create mode 100644 doc/elf_version.3

diff --git a/doc/Makefile.am b/doc/Makefile.am
index 0c094af2..6a858c59 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -18,7 +18,11 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 EXTRA_DIST = COPYING-GFDL README
 dist_man1_MANS=readelf.1 elfclassify.1 srcfiles.1
-notrans_dist_man3_MANS=elf_update.3 elf_getdata.3 elf_clone.3 elf_begin.3
+
+notrans_dist_man3_MANS = elf_update.3 elf_getdata.3 elf_clone.3 elf_begin.3 \
+	elf32_getehdr.3 elf64_getehdr.3 elf_errmsg.3 elf_errno.3 \
+	elf_version.3
+
 notrans_dist_man7_MANS=
 notrans_dist_man8_MANS=
 notrans_dist_man1_MANS=
diff --git a/doc/elf32_getehdr.3 b/doc/elf32_getehdr.3
new file mode 100644
index 00000000..4dbb3886
--- /dev/null
+++ b/doc/elf32_getehdr.3
@@ -0,0 +1,36 @@
+.TH ELF32_GETEHDR 3
+.SH NAME
+elf32_getehdr \- retrieve the ELF header for a 32-bit ELF descriptor
+
+.SH SYNOPSIS
+.nf
+#include <libelf.h>
+
+Elf32_Ehdr *elf32_getehdr(Elf *elf);
+.fi
+
+.SH DESCRIPTION
+.B elf32_getehdr
+retrieves the ELF header for the given 32-bit ELF descriptor
+.I elf.
+The ELF header contains crucial metadata about the ELF file, such as the type, machine, version, entry point, program header table offset, and section header table offset.
+
+.SH PARAMETERS
+.TP
+.I elf
+Pointer to the ELF descriptor from which to retrieve the ELF header.
+
+.SH RETURN VALUE
+On success,
+.B elf32_getehdr
+returns a pointer to the
+.B Elf32_Ehdr
+structure. If the ELF descriptor is invalid or not a 32-bit ELF, it returns NULL and sets an error code retrievable by
+.BR elf_errno (3).
+
+.SH SEE ALSO
+.BR elf64_getehdr (3),
+.BR elf_begin (3)
+
+.SH REPORTING BUGS
+Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.
diff --git a/doc/elf64_getehdr.3 b/doc/elf64_getehdr.3
new file mode 100644
index 00000000..acf9a125
--- /dev/null
+++ b/doc/elf64_getehdr.3
@@ -0,0 +1,36 @@
+.TH ELF64_GETEHDR 3
+.SH NAME
+elf64_getehdr \- retrieve the ELF header for a 64-bit ELF descriptor
+
+.SH SYNOPSIS
+.nf
+#include <libelf.h>
+
+Elf64_Ehdr *elf64_getehdr(Elf *elf);
+.fi
+
+.SH DESCRIPTION
+.B elf64_getehdr
+retrieves the ELF header for the given 64-bit ELF descriptor
+.I elf.
+The ELF header contains crucial metadata about the ELF file, such as the type, machine, version, entry point, program header table offset, and section header table offset.
+
+.SH PARAMETERS
+.TP
+.I elf
+Pointer to the ELF descriptor from which to retrieve the ELF header.
+
+.SH RETURN VALUE
+On success,
+.B elf64_getehdr
+returns a pointer to the
+.B Elf64_Ehdr
+structure. If the ELF descriptor is invalid or not a 64-bit ELF, it returns NULL and sets an error code retrievable by
+.BR elf_errno (3).
+
+.SH SEE ALSO
+.BR elf64_getehdr (3),
+.BR elf_begin (3)
+
+.SH REPORTING BUGS
+Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.
diff --git a/doc/elf_errmsg.3 b/doc/elf_errmsg.3
new file mode 100644
index 00000000..1031b581
--- /dev/null
+++ b/doc/elf_errmsg.3
@@ -0,0 +1,26 @@
+.TH ELF_ERRMSG 3
+
+.SH NAME
+elf_errmsg \- return the error message string for a given libelf error code.
+
+.SH SYNOPSIS
+.B #include <libelf.h>
+
+.BI "const char *elf_errmsg(int " err ");"
+
+.SH DESCRIPTION
+The \fBelf_errmsg\fP function retrieves a human-readable string corresponding to the most recent error code set by a libelf library function. If \fIerr\fP is 0, the function returns the error message for the most recent error code. If \fIerr\fP is non-zero, the function returns the error message for the specified error code.
+
+.SH PARAMETERS
+.TP
+.I err
+An \fIint\fP value specifying the error code. If this value is 0, the function returns the error message for the most recent error. If this value is non-zero, the function returns the error message for the specified error code.
+
+.SH RETURN VALUE
+The \fBelf_errmsg\fP function returns a string containing the error message. If there is no corresponding error message, it returns NULL.
+
+.SH SEE ALSO
+.BR elf_errno (3)
+
+.SH REPORTING BUGS
+Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.
diff --git a/doc/elf_errno.3 b/doc/elf_errno.3
new file mode 100644
index 00000000..e25f5207
--- /dev/null
+++ b/doc/elf_errno.3
@@ -0,0 +1,24 @@
+.TH ELF_ERRNO 3
+
+.SH NAME
+elf_errno \- retrieve the error code of the last failing libelf function call.
+
+.SH SYNOPSIS
+.B #include <libelf.h>
+
+.BI "int elf_errno(void);"
+
+.SH DESCRIPTION
+The \fBelf_errno\fP function retrieves the error code of the last failing libelf library function. This error code indicates the type of error that occurred during the failing function call.
+
+.SH PARAMETERS
+This function does not take any parameters.
+
+.SH RETURN VALUE
+The \fBelf_errno\fP function returns an integer representing the most recent error code. If no error has occurred, it returns 0. If an error occurred, the function returns a non-zero error code that corresponds to the specific error.  Error codes can be passed to \fBelf_errmsg\fP in order to create a string describing the error.
+
+.SH SEE ALSO
+.BR elf_errmsg (3)
+
+.SH REPORTING BUGS
+Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.
diff --git a/doc/elf_version.3 b/doc/elf_version.3
new file mode 100644
index 00000000..fd309ae1
--- /dev/null
+++ b/doc/elf_version.3
@@ -0,0 +1,23 @@
+.TH ELF_VERSION 3
+
+.SH NAME
+elf_version \- set the ELF library version
+
+.SH SYNOPSIS
+.B #include <libelf.h>
+
+.BI "unsigned int elf_version(unsigned int " version ");"
+
+.SH DESCRIPTION
+The \fBelf_version\fP function sets the library's ELF version to the specified value. This function must be called before any other libelf functions are used.
+
+.SH PARAMETERS
+.TP
+.I version
+An \fIunsigned int\fP value specifying the desired ELF library version. This is should be set to \fBEV_CURRENT\fP to indicate the current version of the library. At this time the only supported \fIversion\fP values are \fBEV_CURRENT\fP and \fBEV_NONE\fP.
+
+.SH RETURN VALUE
+The \fBelf_version\fP function returns \fBEV_CURRENT\fP when \fIversion\fP is supported. If the specified version is not supported, it returns \fBEV_NONE\fP.
+
+.SH REPORTING BUGS
+Report bugs to <elfutils-devel@sourceware.org> or https://sourceware.org/bugzilla/.
-- 
2.45.2


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