[src/trunk]: src/external/cddl/osnet/dist/lib/libdtrace/common Handle automat...

[hannken <hannken%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a0733e977651
branches:  trunk
changeset: 457925:a0733e977651
user:      hannken <hannken%NetBSD.org@localhost>
date:      Wed Jul 24 16:57:45 2019 +0000

description:
Handle automatic module loading on device open more like FreeBSD does.

Where FreeBSD uses a module "dtraceall" that depends on all dtrace
modules we now load the basic set "dtrace sdt fbt syscall" on open.

diffstat:

 external/cddl/osnet/dist/lib/libdtrace/common/dt_open.c |  31 +++++++++++++---
 1 files changed, 24 insertions(+), 7 deletions(-)

diffs (47 lines):

diff -r 01a81c6a9be8 -r a0733e977651 external/cddl/osnet/dist/lib/libdtrace/common/dt_open.c
--- a/external/cddl/osnet/dist/lib/libdtrace/common/dt_open.c   Wed Jul 24 16:54:37 2019 +0000
+++ b/external/cddl/osnet/dist/lib/libdtrace/common/dt_open.c   Wed Jul 24 16:57:45 2019 +0000
@@ -1140,19 +1140,36 @@
         */
        dt_provmod_open(&provmod, &df);
 
-#ifdef __NetBSD__
+#if defined(__NetBSD__)
        modctl_load_t cmdargs;
+       const char * const mod_list[] = {
+               "dtrace",
+               "dtrace_sdt",
+               "dtrace_fbt",
+               "dtrace_syscall"
+       };
 
-       cmdargs.ml_filename = "dtrace";
-       cmdargs.ml_flags = MODCTL_NO_PROP;
-       cmdargs.ml_props = NULL;
-       cmdargs.ml_propslen = 0;
+       dtfd = -1;
+       err = 0;
+       for (i = 0; i < __arraycount(mod_list); i++) {
+               cmdargs.ml_filename = mod_list[i];
+               cmdargs.ml_flags = MODCTL_NO_PROP;
+               cmdargs.ml_props = NULL;
+               cmdargs.ml_propslen = 0;
 
-       (void)modctl(MODCTL_LOAD, &cmdargs);
+               if (modctl(MODCTL_LOAD, &cmdargs) < 0 && errno != EEXIST) {
+                       err = errno;
+                       break;
+               }
+       }
+       if (err == 0) {
+               dtfd = open("/dev/dtrace/dtrace", O_RDWR);
+               err = errno; /* save errno from opening dtfd */
+       }
 #endif
+#if defined(__FreeBSD__)
        dtfd = open("/dev/dtrace/dtrace", O_RDWR);
        err = errno; /* save errno from opening dtfd */
-#if defined(__FreeBSD__)
        /*
         * Automatically load the 'dtraceall' module if we couldn't open the
         * char device.