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Date: Tue, 3 Feb 2015 14:53:08 +1100 From: Michael Ellerman <mpe@...erman.id.au> To: <linux-kernel@...r.kernel.org> Cc: linux-api@...r.kernel.org, geert@...ux-m68k.org, drysdale@...gle.com, shuahkh@....samsung.com, davej@...emonkey.org.uk Subject: [PATCH v2] selftests/exec: Check if the syscall exists and bail if not On systems which don't implement sys_execveat(), this test produces a lot of output. Add a check at the beginning to see if the syscall is present, and if not just note one error and return. When we run on a system that doesn't implement the syscall we will get ENOSYS back from the kernel, so change the logic that handles __NR_execveat not being defined to also use ENOSYS rather than -ENOSYS. Signed-off-by: Michael Ellerman <mpe@...erman.id.au> --- v2: Switch to positive ENOSYS. Confirmed this works as expected in the case where the syscall is defined, but then is not present at runtime. tools/testing/selftests/exec/execveat.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/exec/execveat.c b/tools/testing/selftests/exec/execveat.c index e238c9559caf..8d5d1d2ee7c1 100644 --- a/tools/testing/selftests/exec/execveat.c +++ b/tools/testing/selftests/exec/execveat.c @@ -30,7 +30,7 @@ static int execveat_(int fd, const char *path, char **argv, char **envp, #ifdef __NR_execveat return syscall(__NR_execveat, fd, path, argv, envp, flags); #else - errno = -ENOSYS; + errno = ENOSYS; return -1; #endif } @@ -234,6 +234,14 @@ static int run_tests(void) int fd_cloexec = open_or_die("execveat", O_RDONLY|O_CLOEXEC); int fd_script_cloexec = open_or_die("script", O_RDONLY|O_CLOEXEC); + /* Check if we have execveat at all, and bail early if not */ + errno = 0; + execveat_(-1, NULL, NULL, NULL, 0); + if (errno == ENOSYS) { + printf("[FAIL] ENOSYS calling execveat - no kernel support?\n"); + return 1; + } + /* Change file position to confirm it doesn't affect anything */ lseek(fd, 10, SEEK_SET); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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