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

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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);
}