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