This is the mail archive of the
gcc-prs@gcc.gnu.org
mailing list for the GCC project.
libstdc++/5003: read in istream(new filebuf(popen())) read only first N bytes
- From: Jean dot Muller at cetelem dot fr
- To: gcc-gnats at gcc dot gnu dot org
- Cc: Arnaud dot Ducousset at cetelem dot fr
- Date: 4 Dec 2001 08:04:36 -0000
- Subject: libstdc++/5003: read in istream(new filebuf(popen())) read only first N bytes
- Reply-to: Jean dot Muller at cetelem dot fr
>Number: 5003
>Category: libstdc++
>Synopsis: read in istream(new filebuf(popen())) read only first N bytes
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Dec 04 00:06:03 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Jean MUller
>Release: gcc version 3.0.2
>Organization:
>Environment:
$ uname -imprsv
SunOS 5.6 Generic_105181-17 sun4m sparc SUNW,SPARCstation-5
$ g++ -v
Reading specs from /opt/gnu/lib/gcc-lib/sparc-sun-solaris2.6/3.0.2/specs
Configured with: ../gcc-3.0.2/configure --prefix=/opt/gnu -enable-languages=c,c++
Thread model: posix
gcc version 3.0.2
>Description:
read with getline() in
new istream(new filebuf(fopen(), ios::in, 100))
works good BUT read in
new istream(new filebuf(popen(), ios::in, 100))
retruns only 100 first bytes then set eof true, even if a
truss shows that read() system call have read more than
100 bytes.
>How-To-Repeat:
$ g++ -o toto toto.cc
$ ./toto
gcount()=20 length()=19 eof=0 bad=0 good=1
gcount()=19 length()=18 eof=0 bad=0 good=1
gcount()=1 length()=0 eof=0 bad=0 good=1
gcount()=21 length()=20 eof=0 bad=0 good=1
gcount()=1 length()=0 eof=0 bad=0 good=1
gcount()=21 length()=20 eof=0 bad=0 good=1
gcount()=1 length()=0 eof=0 bad=0 good=1
gcount()=16 length()=16 eof=1 bad=0 good=0
nb lines=8
total=100
# READ ONLY 100 first bytes !
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="toto.cc"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="toto.cc"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