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[bug #2684] Set close-on-exec flag on all file descriptors
From: |
nobody |
Subject: |
[bug #2684] Set close-on-exec flag on all file descriptors |
Date: |
Thu, 02 Oct 2003 16:15:07 -0400 |
User-agent: |
Mozilla/5.0 (compatible; Konqueror/3.1; Linux; X11; i686; de, address@hidden) |
=================== BUG #2684: LATEST MODIFICATIONS ==================
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=2684&group_id=85
Changes by: Michael Koch <address@hidden>
Date: Thu 10/02/2003 at 20:15 (GMT)
What | Removed | Added
---------------------------------------------------------------------------
Assigned to | mkoch | None
Status | In Process | Open
=================== BUG #2684: FULL BUG SNAPSHOT ===================
Submitted by: archie172 Project: classpath
Submitted on: Fri 02/28/2003 at 21:23
Severity: 5 - Major Resolution: None
Assigned to: None Status: Open
Platform Version: None
Summary: Set close-on-exec flag on all file descriptors
Original Submission: The Java facilities for fork()'ing and exec()'ing
separate processes are more limited than general UNIX.
Only file descriptors 0, 1, and 2 can be meaningfully
inherited by a child process.
Therefore, all file descriptors opened in native code
should have "fcntl(fd, F_SETFD, 1)" called on them to
set the close-on-exec flag. Otherwise, the child process
might muck up the Java file descriptor by moving a file
pointer, etc.
This includes both java.io file descriptors as well
as java.net socket file descriptors. The latter are perhaps
more important because a child process can e.g. keep a TCP
connection open indefinitely even though the Java process
has closed it.
Follow-up Comments
*******************
-------------------------------------------------------
Date: Fri 02/28/2003 at 21:25 By: archie172
An alternate more hacky approach would be to do something
like this right after calling fork()..
for (i = 3; i < 9999; i++)
(void)close(i);
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http://savannah.gnu.org/bugs/?func=detailbug&bug_id=2684&group_id=85
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