This patch implement a new syscall sys_nonseqfd():
int nonseqfd(int fd, int flags);
The sys_nonseqfd() syscall can be used to map an existing file
descriptor inside the non-sequential fd area.
Signed-off-by: Davide Libenzi <[email protected]>
- Davide
Index: linux-2.6.mod/fs/fcntl.c
===================================================================
--- linux-2.6.mod.orig/fs/fcntl.c 2007-06-06 12:48:03.000000000 -0700
+++ linux-2.6.mod/fs/fcntl.c 2007-06-06 12:48:35.000000000 -0700
@@ -81,6 +81,25 @@
return fd;
}
+asmlinkage long sys_nonseqfd(unsigned int fd, unsigned int flags)
+{
+ struct files_struct *files = current->files;
+ int nfd = -EBADF;
+ struct file *file;
+
+ spin_lock(&files->file_lock);
+ if (!(file = fcheck(fd)))
+ goto out_unlock;
+ nfd = __alloc_nonseq_fd(files, flags);
+ if (likely(nfd >= 0))
+ get_file(file);
+out_unlock:
+ spin_unlock(&files->file_lock);
+ if (likely(nfd >= 0))
+ fd_install(nfd, file);
+ return nfd;
+}
+
static int dupfd(struct file *file, unsigned int start)
{
struct files_struct *files = current->files;
Index: linux-2.6.mod/include/linux/syscalls.h
===================================================================
--- linux-2.6.mod.orig/include/linux/syscalls.h 2007-06-06 12:38:27.000000000 -0700
+++ linux-2.6.mod/include/linux/syscalls.h 2007-06-06 12:48:35.000000000 -0700
@@ -302,6 +302,7 @@
asmlinkage long sys_fcntl64(unsigned int fd,
unsigned int cmd, unsigned long arg);
#endif
+asmlinkage long sys_nonseqfd(unsigned int fd, unsigned int flags);
asmlinkage long sys_dup(unsigned int fildes);
asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd);
asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int on);
-
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