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/* fcntl.cc: fcntl syscall
Copyright 1996, 1997, 1998 Cygnus Solutions.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <fcntl.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include "fhandler.h"
#include "dtable.h"
#include "cygerrno.h"
#include "thread.h"
extern "C"
int
_fcntl (int fd, int cmd,...)
{
void *arg = NULL;
va_list args;
int res;
if (fdtab.not_open (fd))
{
set_errno (EBADF);
res = -1;
goto done;
}
SetResourceLock(LOCK_FD_LIST,WRITE_LOCK|READ_LOCK, "_fcntl");
va_start (args, cmd);
arg = va_arg (args, void *);
if (cmd == F_DUPFD)
res = dup2 (fd, fdtab.find_unused_handle ((int) arg));
else
res = fdtab[fd]->fcntl(cmd, arg);
va_end (args);
ReleaseResourceLock(LOCK_FD_LIST,WRITE_LOCK|READ_LOCK,"_fcntl");
done:
syscall_printf ("%d = fcntl (%d, %d, %p)", res, fd, cmd, arg);
return res;
}
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