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Cygwin: introduce fhandler_process_fd and add stat(2) handling

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move special fd symlink code into own fhandler_process_fd class
to simplify further additions to /proc/PID/fd/DESCRIPTOR symlink
handling.

Add a method to handle stat(2) on such a proc fd symlink by handle.
This allows correct reply from stat(2) if the target file has been
deleted.  This eventually fixes `awk -f /dev/fd/3 3<<eof'.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2019-01-06 20:18:14 +01:00
parent ba12614f79
commit 7aca27b4fe
6 changed files with 189 additions and 164 deletions
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32
winsup/cygwin/fhandler.h
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@@ -2545,6 +2545,7 @@ class fhandler_registry: public fhandler_proc
class pinfo;
class fhandler_process: public fhandler_proc
{
protected:
pid_t pid;
virtual_ftype_t fd_type;
public:
@@ -2554,8 +2555,6 @@ class fhandler_process: public fhandler_proc
int closedir (DIR *);
int __reg3 readdir (DIR *, dirent *);
int open (int flags, mode_t mode = 0);
virtual fhandler_base *fd_reopen (int);
int __reg2 link (const char *);
int __reg2 fstat (struct stat *buf);
bool fill_filebuf ();
@@ -2577,6 +2576,34 @@ class fhandler_process: public fhandler_proc
}
};
class fhandler_process_fd : public fhandler_process
{
fhandler_base *fetch_fh (HANDLE &);
public:
fhandler_process_fd () : fhandler_process () {}
fhandler_process_fd (void *) {}
virtual fhandler_base *fd_reopen (int);
int __reg2 fstat (struct stat *buf);
virtual int __reg2 link (const char *);
void copyto (fhandler_base *x)
{
x->pc.free_strings ();
*reinterpret_cast<fhandler_process_fd *> (x) = *this;
x->reset (this);
}
fhandler_process_fd *clone (cygheap_types malloc_type = HEAP_FHANDLER)
{
void *ptr = (void *) ccalloc (malloc_type, 1, sizeof (fhandler_process_fd));
fhandler_process_fd *fh = new (ptr) fhandler_process_fd (ptr);
copyto (fh);
return fh;
}
};
class fhandler_procnet: public fhandler_proc
{
pid_t pid;
@@ -2638,6 +2665,7 @@ typedef union
char __pipe[sizeof (fhandler_pipe)];
char __proc[sizeof (fhandler_proc)];
char __process[sizeof (fhandler_process)];
char __process_fd[sizeof (fhandler_process_fd)];
char __procnet[sizeof (fhandler_procnet)];
char __procsys[sizeof (fhandler_procsys)];
char __procsysvipc[sizeof (fhandler_procsysvipc)];