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[PATCH] get rid of corner case in dup3() entirely 

Since Ulrich is OK with getting rid of dup3(fd, fd, flags) completely,
to hell the damn thing goes.  Corner case for dup2() is handled in
sys_dup2() (complete with -EBADF if dup2(fd, fd) is called with fd
that is not open), the rest is done in dup3().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-07-26 13:38:19 -04:00
parent 4cc38a1b38
commit 6c5d0512a0
1 changed files with 11 additions and 9 deletions
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20
fs/fcntl.c
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@ -135,18 +135,12 @@ asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
if ((flags & ~O_CLOEXEC) != 0)
return -EINVAL;
if (unlikely(oldfd == newfd))
return -EINVAL;
spin_lock(&files->file_lock);
if (!(file = fcheck(oldfd)))
goto out_unlock;
err = newfd;
if (unlikely(newfd == oldfd)) {
if (flags & O_CLOEXEC) {
fdt = files_fdtable(files);
FD_SET(newfd, fdt->close_on_exec);
}
goto out_unlock;
}
err = -EBADF;
if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
goto out_unlock;
get_file(file); /* We are now finished with oldfd */
@ -194,6 +188,14 @@ asmlinkage long sys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
{
if (unlikely(newfd == oldfd)) { /* corner case */
struct files_struct *files = current->files;
rcu_read_lock();
if (!fcheck_files(files, oldfd))
oldfd = -EBADF;
rcu_read_unlock();
return oldfd;
}
return sys_dup3(oldfd, newfd, 0);
}