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From: "jengelh at inai dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/31143] New: Let iconv_open return EMFILE if
 RLIMIT_NOFILE is hit
Date: Tue, 12 Dec 2023 02:00:33 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: locale
X-Bugzilla-Version: 2.38
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: jengelh at inai dot de
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31143

            Bug ID: 31143
           Summary: Let iconv_open return EMFILE if RLIMIT_NOFILE is hit
           Product: glibc
           Version: 2.38
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: jengelh at inai dot de
  Target Milestone: ---

Consider a program that opens a lot of file descriptors, by chance so happe=
ns
to stay just barely under the limit, and at some point uses iconv_open.
Pathalogical testcase:

#include <iconv.h>
#include <sys/resource.h>
#include <stdio.h>
int main()
{
        struct rlimit rl =3D {3,3};
        if (setrlimit(RLIMIT_NOFILE, &rl) !=3D 0)=20
                perror("setrlimit");

        iconv_t cd =3D iconv_open("UTF-8", "windows-1254//IGNORE");
        if (cd =3D=3D (iconv_t)-1)
                perror("iconv_open");
}

=3D=3D Observed behavior

On a typical linux-glibc system, this will report:

       iconv_open: Invalid argument

=3D=3D Expected

       iconv_open: Too many files open

glibc iconv is implemented with shared plugins (/usr/lib/gconv), thus the
implementation is susceptible to fd limits. Though EINVAL is not incorrect =
per
se (no module loaded - no charset available), it could help the admin to se=
e an
EMFILE errno.

--=20
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