[Bug libfortran/30162] [4.7/4.8 Regression] Unformatted sequential I/O with named pipes does not work

[jb at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30162

--- Comment #51 from Janne Blomqvist <jb at gcc dot gnu.org> 2013-02-19 22:48:50 UTC ---
(In reply to comment #22)
> Revision 180701 removed all checks for special files in unit.c:unit_truncate().
> As a consequence programs compiled with gfortran 4.6.3 and newer cannot to
> write (formatted) to Unix named pipes as ftruncate() fails with EINVAL:
> 
> (64-bit code)
> 
> lseek(3, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
> write(3, " Hello, world!\n", 15)        = 15
> lseek(3, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
> ftruncate(3, 18446744073709551615)      = -1 EINVAL (Invalid argument)
> 
> (32-bit code)
> 
> _llseek(3, 0, 0xffba8fa0, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
> write(3, " Hello, world!\n", 15)        = 15
> _llseek(3, 0, 0xffba9080, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
> ftruncate64(3, 18446744073709551615)    = -1 EINVAL (Invalid argument)

This bug (http://stackoverflow.com/questions/11780556/write-to-fifo-named-pipe
, presumably) should be fixed by the patch at

http://gcc.gnu.org/ml/gcc-patches/2013-02/msg00923.html