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 };
  18
  19 static inline void
  20 trace_seq_init(struct trace_seq *s)
  21 {
  22         s->len = 0;
  23         s->readpos = 0;
  24 }
  25
  26 /*
  27  * Currently only defined when tracing is enabled.
  28  */
  29 #ifdef CONFIG_TRACING
  30 extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  31         __attribute__ ((format (printf, 2, 3)));
  32 extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
  33         __attribute__ ((format (printf, 2, 0)));
  34 extern int
  35 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
  36 extern void trace_print_seq(struct seq_file *m, struct trace_seq *s);
  37 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  38                                  size_t cnt);
  39 extern int trace_seq_puts(struct trace_seq *s, const char *str);
  40 extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
  41 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
  42 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  43                                 size_t len);
  44 extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
  45 extern int trace_seq_path(struct trace_seq *s, struct path *path);
  46
  47 #else /* CONFIG_TRACING */
  48 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  49 {
  50         return 0;
  51 }
  52 static inline int
  53 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  54 {
  55         return 0;
  56 }
  57
  58 static inline void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  59 {
  60 }
  61 static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  62                                  size_t cnt)
  63 {
  64         return 0;
  65 }
  66 static inline int trace_seq_puts(struct trace_seq *s, const char *str)
  67 {
  68         return 0;
  69 }
  70 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
  71 {
  72         return 0;
  73 }
  74 static inline int
  75 trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
  76 {
  77         return 0;
  78 }
  79 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  80                                        size_t len)
  81 {
  82         return 0;
  83 }
  84 static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
  85 {
  86         return NULL;
  87 }
  88 static inline int trace_seq_path(struct trace_seq *s, struct path *path)
  89 {
  90         return 0;
  91 }
  92 #endif /* CONFIG_TRACING */
  93
  94 #endif /* _LINUX_TRACE_SEQ_H */