[PATCH] selftests/landlock:Fix net_test build issues with old libc

[Mickaël Salaün]

Thanks, I tweaked a bit and merged this patch in my next branch.

On Tue, Jan 23, 2024 at 02:26:21PM +0800, Hu Yadi wrote:
> From: "Hu.Yadi" <hu.yadi at h3c.com>

There is an extra "." here, I fixed it. You don't need to add this From
field if it matches your email's From one.

> 
> Fixes: a549d055a22e ("selftests/landlock: Add network tests")
> 
> one issues comes up while building selftest/landlock/net_test on my side
> (gcc 7.3/glibc-2.28/kernel-4.19)
> 
> net_test.c: In function ‘set_service’:
> net_test.c:91:45: warning: implicit declaration of function ‘gettid’; [-Wimplicit-function-declaration]
>     "_selftests-landlock-net-tid%d-index%d", gettid(),
>                                              ^~~~~~
>                                              getgid
> net_test.c:(.text+0x4e0): undefined reference to `gettid'
> 
> Signed-off-by: Hu Yadi <hu.yadi at h3c.com>
> Suggested-by: Jiao <jiaoxupo at h3c.com>
> Reviewed-by: Berlin <berlin at h3c.com>
> ---
>  tools/testing/selftests/landlock/net_test.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
> index 929e21c4db05..6cc1bb1a9166 100644
> --- a/tools/testing/selftests/landlock/net_test.c
> +++ b/tools/testing/selftests/landlock/net_test.c
> @@ -18,9 +18,15 @@
>  #include <sys/prctl.h>
>  #include <sys/socket.h>
>  #include <sys/un.h>
> -
> +#include <sys/syscall.h>
>  #include "common.h"
> 
> +
> +static pid_t sys_gettid(void)
> +{
> +	return syscall(__NR_gettid);
> +}
> +
>  const short sock_port_start = (1 << 10);
> 
>  static const char loopback_ipv4[] = "127.0.0.1";
> @@ -88,7 +94,7 @@ static int set_service(struct service_fixture *const srv,
>  	case AF_UNIX:
>  		srv->unix_addr.sun_family = prot.domain;
>  		sprintf(srv->unix_addr.sun_path,
> -			"_selftests-landlock-net-tid%d-index%d", gettid(),
> +			"_selftests-landlock-net-tid%d-index%d", sys_gettid(),
>  			index);
>  		srv->unix_addr_len = SUN_LEN(&srv->unix_addr);
>  		srv->unix_addr.sun_path[0] = '\0';
> --
> 2.23.0
> 
>