2 * bpf-script-test-prologue.c
5 #ifndef LINUX_VERSION_CODE
6 # error Need LINUX_VERSION_CODE
7 # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
9 #define SEC(NAME) __attribute__((section(NAME), used))
11 #include <uapi/linux/fs.h>
13 #define FMODE_READ 0x1
14 #define FMODE_WRITE 0x2
16 static void (*bpf_trace_printk
)(const char *fmt
, int fmt_size
, ...) =
19 SEC("func=null_lseek file->f_mode offset orig")
20 int bpf_func__null_lseek(void *ctx
, int err
, unsigned long f_mode
,
21 unsigned long offset
, unsigned long orig
)
25 if (f_mode
& FMODE_WRITE
)
34 char _license
[] SEC("license") = "GPL";
35 int _version
SEC("version") = LINUX_VERSION_CODE
;