diff options
Diffstat (limited to 'tapsets.cxx')
| -rw-r--r-- | tapsets.cxx | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/tapsets.cxx b/tapsets.cxx index 43f18c66..34834033 100644 --- a/tapsets.cxx +++ b/tapsets.cxx @@ -22,6 +22,7 @@ #include <cstdarg> extern "C" { +#include <fcntl.h> #include <elfutils/libdwfl.h> #include <elfutils/libdw.h> #include <dwarf.h> @@ -1484,6 +1485,22 @@ dwarf_derived_probe::dwarf_derived_probe (dwarf_query & q, module_bias(q.dw.module_bias), has_return (q.has_return) { + // Lock the kernel module in memory. + if (module_name != TOK_KERNEL) + { + // XXX: There is a race window here, between the time that libdw + // opened up this same file for its relocation duties, and now. + int fd = q.sess.module_fds[module_name]; + if (fd == 0) + { + string sys_module = "/sys/module/" + module_name + "/sections/.text"; + fd = open (sys_module.c_str(), O_RDONLY); + if (fd < 0) + throw semantic_error ("error opening module refcount-bumping file."); + q.sess.module_fds[module_name] = fd; + } + } + // first synthesize an "expanded" location vector<probe_point::component*> comps; comps.push_back |