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[Bug libc/19492] New: fgets() from multiple processes
- From: "tkur at dx dot sly.io" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 19 Jan 2016 14:24:36 +0000
- Subject: [Bug libc/19492] New: fgets() from multiple processes
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=19492
Bug ID: 19492
Summary: fgets() from multiple processes
Product: glibc
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: tkur at dx dot sly.io
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Hi.
I read a file in a child process using fgets(). When child read some words,
child normally exits and parent forks new one, that continues to read file.
Second child process loses some data at the beginning. F.e. I have a file that
contains of:
aaaa
bbbb
cccc
dddd
eeee
ffff
gggg
hhhh
First child should read 4 words and it successfully do it. Then it exits,
parent forks new one. Second child should also read 4 words, but it reads this:
f
gggg
hhhh
Of course I read more data than 4 words. It is just example.
Why second process loses data?
OS Ubuntu 14.04
Thank you.
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