Bug 4892 - dup2(1, OPEN_MAX) return is not POSIX.1 conformant
Summary: dup2(1, OPEN_MAX) return is not POSIX.1 conformant
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel
Version: 6.0
Hardware: i386
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Michael K. Johnson
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Blocks:
TreeView+ depends on / blocked
 
Reported: 1999-09-03 19:10 UTC by Jay Turner
Modified: 2015-01-07 23:37 UTC (History)
2 users (show)

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Clone Of:
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Last Closed: 2000-04-22 06:09:02 UTC

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Description Glen Foster 1999-09-03 19:10:52 UTC 
According to POSIX.1 (page 149, 6.2.1.4, lines 70-74), a
call to dup2(1, sysconf(_SC_OPEN_MAX)) should set errno to
EBADF, but instead (incorrectly) sets errno == EMFILE.

This is seen running the PCTS on a stock 6.0 Intel system.
Comment 1 Cristian Gafton 2000-01-04 22:25:59 UTC 
Assigned to dledford
Comment 2 Cristian Gafton 2000-01-04 22:26:59 UTC 
Assigned to dledford
Comment 3 Bill Nottingham 2000-02-05 23:31:59 UTC 
Still exists in 2.2.15pre5.
Comment 4 Doug Ledford 2000-04-22 06:09:59 UTC 
Last I knew, this is a backwards compatibility issue.  In order to keep older
binaries from breaking on new kernels that support thousands of open files in a
single application, the kernels have to *pretend* like OPEN_MAX is 1024, like it
used to be.  However, to those applications that know about it, they can call
setrlimit() to increase the number of files allowed.  As far as I know, the
result of this situation is that we have some differing error returns and this
is by design.  If that's wrong, then I'm sure Alan can correct it ;-)
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