linux/include/linux/trace_seq.h
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   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
  13struct trace_seq {
  14        unsigned char           buffer[PAGE_SIZE];
  15        unsigned int            len;
  16        unsigned int            readpos;
  17        int                     full;
  18};
  19
  20static inline void
  21trace_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
  32extern __printf(2, 3)
  33int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
  34extern __printf(2, 0)
  35int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
  36extern int
  37trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
  38extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
  39extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  40                                 size_t cnt);
  41extern int trace_seq_puts(struct trace_seq *s, const char *str);
  42extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
  43extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
  44extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  45                                size_t len);
  46extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
  47extern int trace_seq_path(struct trace_seq *s, const struct path *path);
  48
  49#else /* CONFIG_TRACING */
  50static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  51{
  52        return 0;
  53}
  54static inline int
  55trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  56{
  57        return 0;
  58}
  59
  60static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
  61{
  62        return 0;
  63}
  64static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  65                                 size_t cnt)
  66{
  67        return 0;
  68}
  69static inline int trace_seq_puts(struct trace_seq *s, const char *str)
  70{
  71        return 0;
  72}
  73static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
  74{
  75        return 0;
  76}
  77static inline int
  78trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
  79{
  80        return 0;
  81}
  82static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
  83                                       size_t len)
  84{
  85        return 0;
  86}
  87static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
  88{
  89        return NULL;
  90}
  91static 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 */
  98
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