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From: DJ Delorie <dj@redhat.com>
To: mtk.manpages@gmail.com
Cc: linux-man@vger.kernel.org, libc-alpha@sourceware.org
Subject: [patch] ldconfig.8: Document file filter and symlink pattern expectations
Date: Mon, 02 Dec 2019 15:32:10 -0500	[thread overview]
Message-ID: <xna78awjsl.fsf@greed.delorie.com> (raw)


Information gleaned from comments in glibc's elf/ldconfig.c

diff --git a/man8/ldconfig.8 b/man8/ldconfig.8
index 4f799962c..15585243c 100644
--- a/man8/ldconfig.8
+++ b/man8/ldconfig.8
@@ -93,6 +93,28 @@ option.
 .B ldconfig
 should normally be run by the superuser as it may require write
 permission on some root owned directories and files.
+.PP
+Note that
+.B ldconfig
+will only look at files that are named
+.I lib*.so*
+(for regular shared objects) or
+.I ld-*.so*
+(for the dynamic loader itsef).  Other files will be ignored.  Also,
+.B ldconfig
+expects a certain pattern to how the symlinks are set up, like this
+example, where the middle file
+.RB ( libfoo.so.1
+here) is the SONAME for the library:
+.PP
+.in +4n
+.EX
+libfoo.so -> libfoo.so.1 -> libfoo.so.1.12
+.EE
+.in
+.PP
+Failure to follow this pattern may result in compatibility issues
+after an upgrade.
 .SH OPTIONS
 .TP
 .BR \-c " \fIfmt\fP, " \-\-format=\fIfmt\fP


             reply	other threads:[~2019-12-02 20:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02 20:32 DJ Delorie [this message]
2019-12-02 21:41 ` [patch] ldconfig.8: Document file filter and symlink pattern expectations Carlos O'Donell
2019-12-14  4:54   ` Michael Kerrisk (man-pages)
2019-12-14  4:54 ` Michael Kerrisk (man-pages)

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