include/linux/trace_seq.h

   1 #ifndef _LINUX_TRACE_SEQ_H
   2 #define _LINUX_TRACE_SEQ_H
   3
   4 #include <linux/fs.h>
   5
   6 #include <asm/page.h>
   7
   8 /*
   9  * Trace sequences are used to allow a function to call several other functions
  10  * to create a string of data to use (up to a max of PAGE_SIZE).
  11  */
  12
  13 struct trace_seq {
  14         unsigned char           buffer[PAGE_SIZE];
  15         unsigned int            len;
  16         unsigned int            readpos;
  17         int                     full;
  18 };
  19
  20 static inline void
  21 trace_seq_init(struct trace_seq *s)
  22 {
  23         s->len = 0;
  24         s->readpos = 0;
  25         s->full = 0;
  26 }
  27
  28 /*
  29  * Currently only defined when tracing is enabled.
  30  */
  31 #ifdef CONFIG_TRACING
  32 extern __printf(2, 3)
  33 int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
  34 extern __printf(2, 0)
  35 int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
  36 extern int
  37 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
  38 extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
  39 extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  40                              int cnt);
  41 extern int trace_seq_puts(struct trace_seq *s, const char *str);
  42 extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
  43 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len);
  44 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  45                                 unsigned int len);
  46 extern int trace_seq_path(struct trace_seq *s, const struct path *path);
  47
  48 extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
  49                              int nmaskbits);
  50
  51 #else /* CONFIG_TRACING */
  52 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  53 {
  54         return 0;
  55 }
  56 static inline int
  57 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  58 {
  59         return 0;
  60 }
  61
  62 static inline int
  63 trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
  64                   int nmaskbits)
  65 {
  66         return 0;
  67 }
  68
  69 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
  70 {
  71         return 0;
  72 }
  73 static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  74                                     int cnt)
  75 {
  76         return 0;
  77 }
  78 static inline int trace_seq_puts(struct trace_seq *s, const char *str)
  79 {
  80         return 0;
  81 }
  82 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
  83 {
  84         return 0;
  85 }
  86 static inline int
  87 trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len)
  88 {
  89         return 0;
  90 }
  91 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  92                                        unsigned int len)
  93 {
  94         return 0;
  95 }
  96 static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
  97 {
  98         return 0;
  99 }
 100 #endif /* CONFIG_TRACING */
 101
 102 #endif /* _LINUX_TRACE_SEQ_H */