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Linux/tools/perf/tests/bpf-script-test-prologue.c

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  1 /*
  2  * bpf-script-test-prologue.c
  3  * Test BPF prologue
  4  */
  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'
  8 #endif
  9 #define SEC(NAME) __attribute__((section(NAME), used))
 10 
 11 #include <uapi/linux/fs.h>
 12 
 13 #define FMODE_READ              0x1
 14 #define FMODE_WRITE             0x2
 15 
 16 static void (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
 17         (void *) 6;
 18 
 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)
 22 {
 23         if (err)
 24                 return 0;
 25         if (f_mode & FMODE_WRITE)
 26                 return 0;
 27         if (offset & 1)
 28                 return 0;
 29         if (orig == SEEK_CUR)
 30                 return 0;
 31         return 1;
 32 }
 33 
 34 char _license[] SEC("license") = "GPL";
 35 int _version SEC("version") = LINUX_VERSION_CODE;
 36 

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