Implement kernel filter support

[lttng-tools.git] / src / common / kernel-ctl / kernel-ctl.c

diff --git a/src/common/kernel-ctl/kernel-ctl.c b/src/common/kernel-ctl/kernel-ctl.c
index 51d01341338441bc3faffbf5f3d9fb5c52b29486..28ed06cbdaa50b5494c698b296e1bc576cdcfd6c 100644 (file)
--- a/src/common/kernel-ctl/kernel-ctl.c
+++ b/src/common/kernel-ctl/kernel-ctl.c
@@ -22,6 +22,7 @@
 #include <sys/ioctl.h>
 #include <string.h>
 #include <common/align.h>
+#include <errno.h>
 
 #include "kernel-ctl.h"
 #include "kernel-ioctl.h"
@@ -298,6 +299,25 @@ int kernctl_stop_session(int fd)
                        LTTNG_KERNEL_SESSION_STOP);
 }
 
+int kernctl_filter(int fd, struct lttng_filter_bytecode *filter)
+{
+       struct lttng_kernel_filter_bytecode *kb;
+       uint32_t len;
+       int ret;
+
+       /* Translate bytecode to kernel bytecode */
+       kb = zmalloc(sizeof(*kb) + filter->len);
+       if (!kb)
+               return -ENOMEM;
+       kb->len = len = filter->len;
+       kb->reloc_offset = filter->reloc_table_offset;
+       kb->seqnum = filter->seqnum;
+       memcpy(kb->data, filter->data, len);
+       ret = ioctl(fd, LTTNG_KERNEL_FILTER, kb);
+       free(kb);
+       return ret;
+}
+
 int kernctl_tracepoint_list(int fd)
 {
        return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,