1 /* 1 /*
2 * bpf-script-test-prologue.c 2 * bpf-script-test-prologue.c
3 * Test BPF prologue 3 * Test BPF prologue
4 */ 4 */
5 #ifndef LINUX_VERSION_CODE 5 #ifndef LINUX_VERSION_CODE
6 # error Need LINUX_VERSION_CODE 6 # error Need LINUX_VERSION_CODE
7 # error Example: for 4.2 kernel, put 'clang-op 7 # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
8 #endif 8 #endif
9 #define SEC(NAME) __attribute__((section(NAME) 9 #define SEC(NAME) __attribute__((section(NAME), used))
10 10
11 #include <uapi/linux/fs.h> 11 #include <uapi/linux/fs.h>
12 12
13 #define FMODE_READ 0x1 13 #define FMODE_READ 0x1
14 #define FMODE_WRITE 0x2 14 #define FMODE_WRITE 0x2
15 15
16 static void (*bpf_trace_printk)(const char *fm 16 static void (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
17 (void *) 6; 17 (void *) 6;
18 18
19 SEC("func=null_lseek file->f_mode offset orig" 19 SEC("func=null_lseek file->f_mode offset orig")
20 int bpf_func__null_lseek(void *ctx, int err, u 20 int bpf_func__null_lseek(void *ctx, int err, unsigned long f_mode,
21 unsigned long offset, 21 unsigned long offset, unsigned long orig)
22 { 22 {
23 if (err) 23 if (err)
24 return 0; 24 return 0;
25 if (f_mode & FMODE_WRITE) 25 if (f_mode & FMODE_WRITE)
26 return 0; 26 return 0;
27 if (offset & 1) 27 if (offset & 1)
28 return 0; 28 return 0;
29 if (orig == SEEK_CUR) 29 if (orig == SEEK_CUR)
30 return 0; 30 return 0;
31 return 1; 31 return 1;
32 } 32 }
33 33
34 char _license[] SEC("license") = "GPL"; 34 char _license[] SEC("license") = "GPL";
35 int _version SEC("version") = LINUX_VERSION_CO 35 int _version SEC("version") = LINUX_VERSION_CODE;
36 36
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