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Implement F_SETFL and F_GETFL support in fcntl.

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This commit is contained in:
Jonas 'Sortie' Termansen 2013-01-14 14:50:49 +01:00
parent ac1d64fd7e
commit 38b146472e
3 changed files with 25 additions and 1 deletions
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17
sortix/descriptor.cpp
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@ -110,6 +110,23 @@ Descriptor::~Descriptor()
{
}
bool Descriptor::SetFlags(int new_dflags)
{
// TODO: Hmm, there is race condition between changing the flags here and
// the code that uses the flags below. We could add a lock, but that
// would kinda prevent concurrency on the same file descriptor. Since
// the chances of this becoming a problem is rather slim (but could
// happen!), we'll do the unsafe thing for now. (See below also)
dflags = (dflags & ~DESCRIPTOR_FLAGS) & (new_dflags & DESCRIPTOR_FLAGS);
return true;
}
int Descriptor::GetFlags()
{
// TODO: The race condition also applies here if the variable can change.
return dflags;
}
Ref<Descriptor> Descriptor::Fork()
{
Ref<Descriptor> ret(new Descriptor(vnode, dflags));

2
sortix/include/sortix/kernel/descriptor.h
View file

@ -53,6 +53,8 @@ public:
Descriptor(Ref<Vnode> vnode, int dflags);
virtual ~Descriptor();
Ref<Descriptor> Fork();
bool SetFlags(int new_dflags);
int GetFlags();
int sync(ioctx_t* ctx);
int stat(ioctx_t* ctx, struct stat* st);
int chmod(ioctx_t* ctx, mode_t mode);

7
sortix/io.cpp
View file

@ -300,6 +300,7 @@ static int sys_fstat(int fd, struct stat* st)
static int sys_fcntl(int fd, int cmd, unsigned long arg)
{
Ref<DescriptorTable> dtable = CurrentProcess()->GetDTable();
Ref<Descriptor> desc;
int ret = -1;
switch ( cmd )
{
@ -310,8 +311,12 @@ static int sys_fcntl(int fd, int cmd, unsigned long arg)
ret = dtable->GetFlags(fd);
break;
case F_SETFL:
if ( (desc = dtable->Get(fd)) )
ret = desc->SetFlags((int) arg) ? 0 : -1;
break;
case F_GETFL:
errno = ENOSYS;
if ( (desc = dtable->Get(fd)) )
ret = desc->GetFlags();
break;
default:
errno = EINVAL;