Add syscall listing 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 078d8528057efa6afa2d3484a1bb25ec28b9a327..a387b93bf87f0334365c3217c95537cf1487e29b 100644 (file)
--- a/src/common/kernel-ctl/kernel-ctl.c
+++ b/src/common/kernel-ctl/kernel-ctl.c
@@ -19,6 +19,7 @@
 #define __USE_LINUX_IOCTL_DEFS
 #include <sys/ioctl.h>
 #include <string.h>
+#include <common/align.h>
 
 #include "kernel-ctl.h"
 #include "kernel-ioctl.h"
@@ -163,6 +164,57 @@ int kernctl_disable_syscall(int fd, const char *syscall_name)
        return ioctl(fd, LTTNG_KERNEL_EVENT, &event);
 }
 
+int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
+{
+       struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
+       size_t array_alloc_len;
+       char *new_mask;
+       int ret = 0;
+
+       if (!syscall_mask) {
+               ret = -1;
+               goto end;
+       }
+
+       if (!nr_bits) {
+               ret = -1;
+               goto end;
+       }
+
+       kmask_len.len = 0;
+       ret = ioctl(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
+       if (ret) {
+               goto end;
+       }
+
+       array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
+
+       kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
+       if (!kmask) {
+               ret = -1;
+               goto end;
+       }
+
+       kmask->len = kmask_len.len;
+       ret = ioctl(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
+       if (ret) {
+               goto end;
+       }
+
+       new_mask = realloc(*syscall_mask, array_alloc_len);
+       if (!new_mask) {
+               ret = -1;
+               goto end;
+       }
+       memcpy(new_mask, kmask->mask, array_alloc_len);
+       *syscall_mask = new_mask;
+       *nr_bits = kmask->len;
+
+end:
+       free(kmask);
+       return ret;
+}
+
 int kernctl_create_stream(int fd)
 {
        return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,