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author | markj <markj@FreeBSD.org> | 2014-08-04 15:36:22 +0000 |
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committer | markj <markj@FreeBSD.org> | 2014-08-04 15:36:22 +0000 |
commit | 2fd28e23736da641dbe3990391f997fb55353b17 (patch) | |
tree | eb6788ffbddddf0e243de1acbb43ecdc0a774121 /cddl/contrib/opensolaris/lib/libdtrace | |
parent | bde3467611213433dffde86fe37fa1ba8c021b09 (diff) | |
download | FreeBSD-src-2fd28e23736da641dbe3990391f997fb55353b17.zip FreeBSD-src-2fd28e23736da641dbe3990391f997fb55353b17.tar.gz |
MFC r256571:
Add a function, memstr, which can be used to convert a buffer of
null-separated strings to a single string. This can be used to print the
full arguments of a process using execsnoop (from the DTrace toolkit) or
with the following one-liner:
dtrace -n 'syscall::execve:return {trace(curpsinfo->pr_psargs);}'
Note that this relies on the process arguments being cached via the struct
proc, which means that it will not work for argvs longer than
kern.ps_arg_cache_limit. However, the following rather non-portable
script can be used to extract any argv at exec time:
fbt::kern_execve:entry
{
printf("%s", memstr(args[1]->begin_argv, ' ',
args[1]->begin_envv - args[1]->begin_argv));
}
The debug.dtrace.memstr_max sysctl limits the maximum argument size to
memstr().
Diffstat (limited to 'cddl/contrib/opensolaris/lib/libdtrace')
-rw-r--r-- | cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c index cf6f2e9..01cf804 100644 --- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c +++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c @@ -323,6 +323,10 @@ static const dt_ident_t _dtrace_globals[] = { &dt_idops_func, "void(@)" }, { "memref", DT_IDENT_FUNC, 0, DIF_SUBR_MEMREF, DT_ATTR_STABCMN, DT_VERS_1_1, &dt_idops_func, "uintptr_t *(void *, size_t)" }, +#if !defined(sun) +{ "memstr", DT_IDENT_FUNC, 0, DIF_SUBR_MEMSTR, DT_ATTR_STABCMN, DT_VERS_1_0, + &dt_idops_func, "string(void *, char, size_t)" }, +#endif { "min", DT_IDENT_AGGFUNC, 0, DTRACEAGG_MIN, DT_ATTR_STABCMN, DT_VERS_1_0, &dt_idops_func, "void(@)" }, { "mod", DT_IDENT_ACTFUNC, 0, DT_ACT_MOD, DT_ATTR_STABCMN, |