Re: [PATCH 2/9] seccomp.2: Use syscall() in the example code

["Alejandro Colomar (man-pages)" <alx.manpages@gmail.com>]

Hi Stephen,

On 1/7/22 17:46, Stephen Kitt wrote:
> Since seccomp() doesn't exist in glibc, avoid relying on it, and use
> syscall() instead. This updates the example program to match the
> documentation, which was updated in commit 5945cd7bd3c3 ("seccomp.2:
> Use syscall(SYS_...); for system calls without a wrapper").
> 
> Signed-off-by: Stephen Kitt <steve@sk2.org>

Patch applied.

Thanks!

Alex

> ---
>   man2/seccomp.2 | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/man2/seccomp.2 b/man2/seccomp.2
> index a3421871f..67928ed3f 100644
> --- a/man2/seccomp.2
> +++ b/man2/seccomp.2
> @@ -1133,6 +1133,7 @@ cecilia
>   #include <linux/filter.h>
>   #include <linux/seccomp.h>
>   #include <sys/prctl.h>
> +#include <sys/syscall.h>
>   
>   #define X32_SYSCALL_BIT 0x40000000
>   #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
> @@ -1190,7 +1191,7 @@ install_filter(int syscall_nr, int t_arch, int f_errno)
>           .filter = filter,
>       };
>   
> -    if (seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog)) {
> +    if (syscall(SYS_seccomp, SECCOMP_SET_MODE_FILTER, 0, &prog)) {
>           perror("seccomp");
>           return 1;
>       }

-- 
Alejandro Colomar
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/