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 ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  40                                  size_t 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, size_t len);
  44 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  45                                 size_t len);
  46 extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
  47 extern int trace_seq_path(struct trace_seq *s, const struct path *path);
  48
  49 #else /* CONFIG_TRACING */
  50 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  51 {
  52         return 0;
  53 }
  54 static inline int
  55 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  56 {
  57         return 0;
  58 }
  59
  60 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
  61 {
  62         return 0;
  63 }
  64 static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  65                                  size_t cnt)
  66 {
  67         return 0;
  68 }
  69 static inline int trace_seq_puts(struct trace_seq *s, const char *str)
  70 {
  71         return 0;
  72 }
  73 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
  74 {
  75         return 0;
  76 }
  77 static inline int
  78 trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
  79 {
  80         return 0;
  81 }
  82 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  83                                        size_t len)
  84 {
  85         return 0;
  86 }
  87 static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
  88 {
  89         return NULL;
  90 }
  91 static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
  92 {
  93         return 0;
  94 }
  95 #endif /* CONFIG_TRACING */
  96
  97 #endif /* _LINUX_TRACE_SEQ_H */