[DTrace-devel] [PATCH 2/4] test: Use syscall in case of no execveat() wrapper

[Kris Van Hees]

On Mon, Oct 06, 2025 at 05:57:24PM -0400, eugene.loh--- via DTrace-devel wrote:
> From: Eugene Loh <eugene.loh at oracle.com>
> 
> While execveat() appeared in kernel 3.19, GNU C library support
> came later.  We are still testing on some systems with older libc.

Wow, we do?  I am curious where...

> Do not assume libc has an execveat() wrapper:  use syscall().
> 
> Signed-off-by: Eugene Loh <eugene.loh at oracle.com>

Reviewed-by: Kris Van Hees <kris.van.hees at oracle.com>

> ---
>  test/unittest/proc/tst.exec-execveat.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/test/unittest/proc/tst.exec-execveat.sh b/test/unittest/proc/tst.exec-execveat.sh
> index db68a5043..e4b9dfa5e 100755
> --- a/test/unittest/proc/tst.exec-execveat.sh
> +++ b/test/unittest/proc/tst.exec-execveat.sh
> @@ -17,7 +17,7 @@ cd $DIRNAME
>  cat << EOF > parent.c
>  #include <stdio.h>
>  #include <linux/fcntl.h>      /* Definition of AT_* constants */
> -#define __USE_GNU             /* so unistd.h will find execveat */
> +#include <sys/syscall.h>      /* Definition of SYS_* constants */
>  #include <unistd.h>
>  
>  int main(int c, char **v) {
> @@ -26,7 +26,7 @@ int main(int c, char **v) {
>    int rc;
>  
>    printf("exec\n");
> -  rc = execveat(AT_FDCWD, "bogus_direc/bogus_exec", argv, envp, 0);
> +  rc = syscall(__NR_execveat, AT_FDCWD, "bogus_direc/bogus_exec", argv, envp, 0);
>  
>    return 0;
>  }
> -- 
> 2.47.3
> 
> 
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