Re: [PATCH 1/4] xfstests: Add an auxiliary program to create an AF_UNIX socket [ver #3]

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Mon, Apr 03, 2017 at 12:59:40PM +0100, David Howells wrote:
> Add an auxiliary program to create an AF_UNIX socket at the specified
> location so that tests can do things with it.
> 
> Signed-off-by: David Howells <dhowells@redhat.com>
> ---
> 
>  .gitignore    |    1 +
>  src/Makefile  |    2 +-
>  src/af_unix.c |   66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 68 insertions(+), 1 deletion(-)
>  create mode 100644 src/af_unix.c
> 
> diff --git a/.gitignore b/.gitignore
> index 1ed2a92..8a7c052 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -35,6 +35,7 @@
>  /ltp/iogen
>  
>  # src/ binaries
> +/src/af_unix
>  /src/alloc
>  /src/append_reader
>  /src/append_writer
> diff --git a/src/Makefile b/src/Makefile
> index a7f27f0..716c178 100644
> --- a/src/Makefile
> +++ b/src/Makefile
> @@ -12,7 +12,7 @@ TARGETS = dirstress fill fill2 getpagesize holes lstat64 \
>  	godown resvtest writemod makeextents itrash rename \
>  	multi_open_unlink dmiperf unwritten_sync genhashnames t_holes \
>  	t_mmap_writev t_truncate_cmtime dirhash_collide t_rename_overwrite \
> -	holetest t_truncate_self t_mmap_dio
> +	holetest t_truncate_self t_mmap_dio af_unix
>  
>  LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
>  	preallo_rw_pattern_writer ftrunc trunc fs_perms testx looptest \
> diff --git a/src/af_unix.c b/src/af_unix.c
> new file mode 100644
> index 0000000..dc2368e
> --- /dev/null
> +++ b/src/af_unix.c
> @@ -0,0 +1,66 @@
> +/* Create an AF_UNIX socket.
> + *
> + * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
> + * Written by David Howells (dhowells@redhat.com)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public Licence
> + * as published by the Free Software Foundation; either version
> + * 2 of the Licence, or (at your option) any later version.
> + */
> +
> +#include <stdarg.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdbool.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <sys/socket.h>
> +#include <sys/un.h>
> +
> +#define offsetof(TYPE, MEMBER)	((size_t)&((TYPE *)0)->MEMBER)
> +
> +int main(int argc, char *argv[])
> +{
> +	struct sockaddr_un sun;
> +	struct stat st;
> +	size_t len, max;
> +	int fd;
> +
> +	if (argc != 2) {
> +		fprintf(stderr, "Format: %s <socketpath>\n", argv[0]);
> +		exit(2);
> +	}
> +
> +	max = sizeof(sun.sun_path);
> +	len = strlen(argv[1]);
> +	if (len >= max) {
> +		fprintf(stderr, "Filename too long (max %zu)\n", max);
> +		exit(2);
> +	}
> +
> +	fd = socket(AF_UNIX, SOCK_DGRAM, 0);
> +	if (fd < 0) {
> +		perror("socket");
> +		exit(1);
> +	}
> +
> +	memset(&sun, 0, sizeof(sun));
> +	sun.sun_family = AF_UNIX;
> +	strcpy(sun.sun_path, argv[1]);
> +	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
> +		perror("bind");
> +		exit(1);
> +	}
> +
> +	if (stat(argv[1], &st)) {
> +		fprintf(stderr, "Couldn't stat socket after creation: %m\n");
> +		exit(1);
> +	}

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> +
> +	exit(0);
> +}
> 
> --
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