Annotation of embedaddon/bird/lib/birdlib.h, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD Library
! 3: *
! 4: * (c) 1998--2004 Martin Mares <mj@ucw.cz>
! 5: *
! 6: * Can be freely distributed and used under the terms of the GNU GPL.
! 7: */
! 8:
! 9: #ifndef _BIRD_BIRDLIB_H_
! 10: #define _BIRD_BIRDLIB_H_
! 11:
! 12: #include "timer.h"
! 13: #include "alloca.h"
! 14:
! 15: /* Ugly structure offset handling macros */
! 16:
! 17: #define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
! 18: #define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))
! 19: #define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
! 20:
! 21: /* Utility macros */
! 22:
! 23: #define MIN_(a,b) (((a)<(b))?(a):(b))
! 24: #define MAX_(a,b) (((a)>(b))?(a):(b))
! 25:
! 26: #ifndef PARSER
! 27: #undef MIN
! 28: #undef MAX
! 29: #define MIN(a,b) MIN_(a,b)
! 30: #define MAX(a,b) MAX_(a,b)
! 31: #endif
! 32:
! 33: #define U64(c) UINT64_C(c)
! 34: #define ABS(a) ((a)>=0 ? (a) : -(a))
! 35: #define DELTA(a,b) (((a)>=(b))?(a)-(b):(b)-(a))
! 36: #define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
! 37:
! 38:
! 39: /* Bitfield macros */
! 40:
! 41: /* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */
! 42: #define BIT32_VAL(p) (((u32) 1) << ((p) % 32))
! 43: #define BIT32_TEST(b,p) ((b)[(p)/32] & BIT32_VAL(p))
! 44: #define BIT32_SET(b,p) ((b)[(p)/32] |= BIT32_VAL(p))
! 45: #define BIT32_CLR(b,p) ((b)[(p)/32] &= ~BIT32_VAL(p))
! 46: #define BIT32_ZERO(b,l) memset((b), 0, (l)/8)
! 47:
! 48: #ifndef NULL
! 49: #define NULL ((void *) 0)
! 50: #endif
! 51:
! 52: #ifndef IPV6
! 53: #define IP_VERSION 4
! 54: #else
! 55: #define IP_VERSION 6
! 56: #endif
! 57:
! 58:
! 59: /* Macros for gcc attributes */
! 60:
! 61: #define NORET __attribute__((noreturn))
! 62: #define UNUSED __attribute__((unused))
! 63: #define PACKED __attribute__((packed))
! 64:
! 65: #ifdef IPV6
! 66: #define UNUSED4
! 67: #define UNUSED6 UNUSED
! 68: #else
! 69: #define UNUSED4 UNUSED
! 70: #define UNUSED6
! 71: #endif
! 72:
! 73: /* Microsecond time */
! 74:
! 75: typedef s64 btime;
! 76:
! 77: #define S_ *1000000
! 78: #define MS_ *1000
! 79: #define US_ *1
! 80: #define TO_S /1000000
! 81: #define TO_MS /1000
! 82: #define TO_US /1
! 83:
! 84: #ifndef PARSER
! 85: #define S S_
! 86: #define MS MS_
! 87: #define US US_
! 88: #endif
! 89:
! 90:
! 91: /* Rate limiting */
! 92:
! 93: struct tbf {
! 94: bird_clock_t timestamp; /* Last update */
! 95: u16 count; /* Available tokens */
! 96: u16 burst; /* Max number of tokens */
! 97: u16 rate; /* Rate of replenishment */
! 98: u16 mark; /* Whether last op was limited */
! 99: };
! 100:
! 101: /* Default TBF values for rate limiting log messages */
! 102: #define TBF_DEFAULT_LOG_LIMITS { .rate = 1, .burst = 5 }
! 103:
! 104: void tbf_update(struct tbf *f);
! 105:
! 106: static inline int
! 107: tbf_limit(struct tbf *f)
! 108: {
! 109: tbf_update(f);
! 110:
! 111: if (!f->count)
! 112: {
! 113: f->mark = 1;
! 114: return 1;
! 115: }
! 116:
! 117: f->count--;
! 118: f->mark = 0;
! 119: return 0;
! 120: }
! 121:
! 122:
! 123: /* Logging and dying */
! 124:
! 125: typedef struct buffer {
! 126: byte *start;
! 127: byte *pos;
! 128: byte *end;
! 129: } buffer;
! 130:
! 131: #define STACK_BUFFER_INIT(buf,size) \
! 132: do { \
! 133: buf.start = alloca(size); \
! 134: buf.pos = buf.start; \
! 135: buf.end = buf.start + size; \
! 136: } while(0)
! 137:
! 138: #define LOG_BUFFER_INIT(buf) \
! 139: STACK_BUFFER_INIT(buf, LOG_BUFFER_SIZE)
! 140:
! 141: #define LOG_BUFFER_SIZE 1024
! 142:
! 143: #define log log_msg
! 144: void log_commit(int class, buffer *buf);
! 145: void log_msg(const char *msg, ...);
! 146: void log_rl(struct tbf *rl, const char *msg, ...);
! 147: void die(const char *msg, ...) NORET;
! 148: void bug(const char *msg, ...) NORET;
! 149:
! 150: #define L_DEBUG "\001" /* Debugging messages */
! 151: #define L_TRACE "\002" /* Protocol tracing */
! 152: #define L_INFO "\003" /* Informational messages */
! 153: #define L_REMOTE "\004" /* Remote protocol errors */
! 154: #define L_WARN "\005" /* Local warnings */
! 155: #define L_ERR "\006" /* Local errors */
! 156: #define L_AUTH "\007" /* Authorization failed etc. */
! 157: #define L_FATAL "\010" /* Fatal errors */
! 158: #define L_BUG "\011" /* BIRD bugs */
! 159:
! 160: void debug(const char *msg, ...); /* Printf to debug output */
! 161:
! 162: /* Debugging */
! 163:
! 164: #if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
! 165: #define DBG(x, y...) debug(x, ##y)
! 166: #else
! 167: #define DBG(x, y...) do { } while(0)
! 168: #endif
! 169:
! 170: #ifdef DEBUGGING
! 171: #define ASSERT(x) do { if (!(x)) bug("Assertion `%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
! 172: #else
! 173: #define ASSERT(x) do { } while(0)
! 174: #endif
! 175:
! 176: /* Pseudorandom numbers */
! 177:
! 178: u32 random_u32(void);
! 179:
! 180: #endif
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