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From: Kevin Ryde <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: manpages-dev: flock(2) second time by same process
Date: Wed, 19 Jan 2005 08:35:21 +1100
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Package: manpages-dev
Version: 2.01-1
Severity: normal
The flock(2) man page says
A process may only hold one type of lock (shared or exclusive) on a
file. Subsequent flock() calls on an already locked file will convert
an existing lock to the new lock mode.
I read this as meaning the lock is associated with the process, and I
tried converting a lock through a second opened fd per the test
program below but it hung after printing "about to do second flock".
The lock is actually associated with the file table entry is it? Or
the table entry plus the process? Perhaps this can be clarified.
#include <stdio.h>
#include <sys/file.h>
int
main (void)
{
int x, y, ret;
x = open ("foo.tmp", O_RDWR | O_CREAT, 0666);
if (x == -1) perror ("first open");
ret = flock (x, LOCK_EX);
if (ret == -1) perror ("first flock");
y = open ("foo.tmp", O_RDWR);
if (y == -1) perror ("first open");
printf ("about to do second flock\n");
ret = flock (y, LOCK_SH);
if (ret == -1) perror ("second flock");
printf ("done\n");
return 0;
}
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i586)
Kernel: Linux 2.6.8-1-386
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages manpages-dev depends on:
ii manpages 2.01-1 Manual pages about using a GNU/Lin
-- no debconf information
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Date: Tue, 22 Nov 2005 11:35:39 -0500
To: [EMAIL PROTECTED], [EMAIL PROTECTED],
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Cc: Martin Schulze <[EMAIL PROTECTED]>, Michael Kerrisk <[EMAIL PROTECTED]>
Subject: fixed in recent uploads of manpages
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From: Justin Pryzby <[EMAIL PROTECTED]>
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version=2.60-bugs.debian.org_2005_01_02
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Version: 2.09-1
These bugs are all reported fixed by the upstream manpages maintainer,
Michael Kerrisk. For my own convenience, I'm marking them all as
"fixed by version 2.09-1", even though some of them are fixed by
earlier uploads. The bug number, correct fixed-in version, and title
are listed below:
#317037 2.06 Difficult to understand in sscanf RETURN VALUE
#315411 2.09 New upstream release: 2.09
#209323 2.09 please include pty(4) manpage
#330877 2.09 read can return EINVAL when using O_DIRECT and buffer not aligned
#321131 2.08 exit.3 missing "is"
#299795 2.07 Some library functions' manpage use wrong hyphen
#295666 2.03 regex.7.gz: The word boundary regexps are unsupported
#326520 2.08 'man msgget' typo: one line not displayed
#306517 2.04 epoll_ctl(2) description differs from implementation
#291121 2.04 flock(2) second time by same process
#323851 2.08 getpwnam.3 manpage should clarify the scope of pw_dir
#323062 2.08 clone(2) CLONE_PARENT_SETTID description incorrect
#101433 2.04 "man setitimer" give bad informations
#113812 2.04 libc6-dev: iconv prototype
#317037 2.06 Difficult to understand in sscanf RETURN VALUE
#219695 2.04 sysconf(3): describes _SC_2_DEV, which doesn't exist
#294890 2.03 Typo in wait(2): "watpid"
--
Clear skies,
Justin
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