Tried looking for a solution but couldn't find anything. If I'm doing
anything wrong please let me know. :)
If I run the following,
foo = open("foo" ,"w")
ccall(:fprintf, Int, (Ptr{Void}, Cstring), Libc.FILE(foo).ptr, "hello,
world\n")
flush(foo)
close(foo)
foo will exists as a file in my current directory, but will not contain
"hello, world\n", only when I exit julia will it write to foo.
When I add
ccall(:fflush, Int, (Ptr{Void},), C_NULL)
at the end, then foo will contain "hello, world\n".
Here's the example output.
samuelmassinon ~$ cat foo
cat: foo: No such file or directory
samuelmassinon ~$ julia
_
_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: http://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.5.0-dev+3075 (2016-03-09 17:54 UTC)
_/ |\__'_|_|_|\__'_| | Commit 597dc7b (0 days old master)
|__/ | x86_64-apple-darwin15.2.0
julia> foo = open("foo" ,"w")
IOStream(<file foo>)
julia> ccall(:fprintf, Int, (Ptr{Void}, Cstring), Libc.FILE(foo).ptr,
"hello, world\n")
13
julia> flush(foo)
IOStream(<file foo>)
julia> close(foo)
shell> cat foo
julia> exit()
samuelmassinon ~$ cat foo
hello, world
I don't think I should have to use fflush to write to a file from c. Is
there a better way of doing this that isn't hacky?
Thanks!
