$ cat open+write.f90
program main
character(len=10) a
call system("rm -f asdf.dat; touch asdf.dat; chmod u-w asdf.dat")
open(file="asdf.dat",unit=10,err=999,action="read")
write(10,*,err=20) "Hello, world"
print *,"write to read-only file succeeded"
call abort
20 continue
! rewind(10)
read(10,'(A)',end=30,err=999) a
print *,"read from empty file succeeded"
call abort
999 continue
print *,"error reading from read-only file"
call abort
30 continue
print *,"Success!"
end
$ gfortran open+write.f90
$ ./a.out
error reading from read-only file
Aborted
Uncommenting the rewind statement leads to
$ ./a.out
read from empty file succeeded
Aborted
$ gfortran -v ; gfortran -dumpmachine
Using built-in specs.
Configured with: ../gcc-4.0-20050109/configure --prefix=/home/zfkts
--enable-languages=c,c++,f95
Thread model: posix
gcc version 4.0.0 20050109 (experimental)
ia64-unknown-linux-gnu
--
Summary: Some read and write confusion with a read-only file
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: Thomas dot Koenig at online dot de
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19451
