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Date: Thu, 23 May 2024 09:12:38 -0400
From: Rich Felker <dalias@...c.org>
To: T A <tony.ambardar@...il.com>
Cc: musl@...ts.openwall.com
Subject: Re: Re: [PATCH v3] add renameat2 linux syscall wrapper
On Mon, May 20, 2024 at 06:42:55PM -0700, T A wrote:
> Hi Rich,
>
> I think this v3 patch addressed all your suggestions. Are any other
> improvements needed?
Looks good. I'll go ahead and merge.
>
> Thanks,
> Tony
>
> On Mon, May 6, 2024, 20:28 Tony Ambardar <tony.ambardar@...il.com> wrote:
>
> > This syscall is available since Linux 3.15 and also implemented in glibc
> > from version 2.28. It is commonly used in filesystem or security contexts.
> >
> > Constants RENAME_NOREPLACE, RENAME_EXCHANGE, RENAME_WHITEOUT are guarded by
> > _GNU_SOURCE as with glibc.
> >
> > Signed-off-by: Tony Ambardar <Tony.Ambardar@...il.com>
> > ---
> > v2 -> v3:
> > * call SYS_renameat first if applicable
> > * drop unneeded error code handling
> >
> > v1 -> v2:
> > * align related constants
> > * drop 'int' from 'unsigned int'
> > * add fallback to SYS_renameat where applicable
> > ---
> > include/stdio.h | 7 +++++++
> > src/linux/renameat2.c | 11 +++++++++++
> > 2 files changed, 18 insertions(+)
> > create mode 100644 src/linux/renameat2.c
> >
> > diff --git a/include/stdio.h b/include/stdio.h
> > index cb858618..4ea4c170 100644
> > --- a/include/stdio.h
> > +++ b/include/stdio.h
> > @@ -158,6 +158,13 @@ char *ctermid(char *);
> > #define L_ctermid 20
> > #endif
> >
> > +#if defined(_GNU_SOURCE)
> > +#define RENAME_NOREPLACE (1 << 0)
> > +#define RENAME_EXCHANGE (1 << 1)
> > +#define RENAME_WHITEOUT (1 << 2)
> > +
> > +int renameat2(int, const char *, int, const char *, unsigned);
> > +#endif
> >
> > #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
> > || defined(_BSD_SOURCE)
> > diff --git a/src/linux/renameat2.c b/src/linux/renameat2.c
> > new file mode 100644
> > index 00000000..b8060388
> > --- /dev/null
> > +++ b/src/linux/renameat2.c
> > @@ -0,0 +1,11 @@
> > +#define _GNU_SOURCE
> > +#include <stdio.h>
> > +#include "syscall.h"
> > +
> > +int renameat2(int oldfd, const char *old, int newfd, const char *new,
> > unsigned flags)
> > +{
> > +#ifdef SYS_renameat
> > + if (!flags) return syscall(SYS_renameat, oldfd, old, newfd, new);
> > +#endif
> > + return syscall(SYS_renameat2, oldfd, old, newfd, new, flags);
> > +}
> > --
> > 2.34.1
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