Hi Michael,
This patch is against man-pages-3.51. It documents the fact that a
successful execve(2) in a process that is sharing a file descriptor table
results in unsharing the table.
I discovered this through testing and verified it by source inspection -
there is a call to unshare_files() early in do_execve_common().
- Kevin
diff -ur man-pages-3.51.orig/man2/clone.2 man-pages-3.51/man2/clone.2
--- man-pages-3.51.orig/man2/clone.2 2013-04-19 21:57:19.000000000 +1000
+++ man-pages-3.51/man2/clone.2 2013-05-06 15:42:06.841539649 +1000
@@ -206,6 +206,9 @@
.BR fcntl (2)
.B F_SETFD
operation), the other process is also affected.
+If a process sharing a file descriptor table calls
+.BR execve (2),
+its file descriptor table is duplicated (unshared).
If
.B CLONE_FILES
Only in man-pages-3.51/man2: clone.2.orig
diff -ur man-pages-3.51.orig/man2/execve.2 man-pages-3.51/man2/execve.2
--- man-pages-3.51.orig/man2/execve.2 2013-04-19 21:57:19.000000000 +1000
+++ man-pages-3.51/man2/execve.2 2013-05-06 15:42:06.841539649 +1000
@@ -204,6 +204,11 @@
.B SIGCHLD
(see
.BR clone (2)).
+.IP *
+The file descriptor table is unshared, undoing the effect of the
+.B CLONE_FILES
+flag of
+.BR clone (2).
.PP
Note the following further points:
.IP * 3
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