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 */ 93