Annotation of embedaddon/bird2/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 "lib/alloca.h"
! 13:
! 14: /* Ugly structure offset handling macros */
! 15:
! 16: struct align_probe { char x; long int y; };
! 17:
! 18: #define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
! 19: #define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))
! 20: #define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
! 21: #define CPU_STRUCT_ALIGN (sizeof(struct align_probe))
! 22:
! 23: /* Utility macros */
! 24:
! 25: #define MIN_(a,b) (((a)<(b))?(a):(b))
! 26: #define MAX_(a,b) (((a)>(b))?(a):(b))
! 27:
! 28: #ifndef PARSER
! 29: #undef MIN
! 30: #undef MAX
! 31: #define MIN(a,b) MIN_(a,b)
! 32: #define MAX(a,b) MAX_(a,b)
! 33: #endif
! 34:
! 35: #define U64(c) UINT64_C(c)
! 36: #define ABS(a) ((a)>=0 ? (a) : -(a))
! 37: #define DELTA(a,b) (((a)>=(b))?(a)-(b):(b)-(a))
! 38: #define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
! 39: #define BYTES(n) ((((uint) (n)) + 7) / 8)
! 40: #define CALL(fn, args...) ({ if (fn) fn(args); })
! 41: #define ADVANCE(w, r, l) ({ r -= (l); w += (l); })
! 42:
! 43: static inline int uint_cmp(uint i1, uint i2)
! 44: { return (int)(i1 > i2) - (int)(i1 < i2); }
! 45:
! 46: static inline int u64_cmp(u64 i1, u64 i2)
! 47: { return (int)(i1 > i2) - (int)(i1 < i2); }
! 48:
! 49:
! 50: /* Bitfield macros */
! 51:
! 52: /* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */
! 53: #define BIT32_VAL(p) (((u32) 1) << ((p) % 32))
! 54: #define BIT32_TEST(b,p) ((b)[(p)/32] & BIT32_VAL(p))
! 55: #define BIT32_SET(b,p) ((b)[(p)/32] |= BIT32_VAL(p))
! 56: #define BIT32_CLR(b,p) ((b)[(p)/32] &= ~BIT32_VAL(p))
! 57: #define BIT32_ZERO(b,l) memset((b), 0, (l)/8)
! 58:
! 59: /* The same, but counting bits from MSB */
! 60: #define BIT32R_VAL(p) ((((u32) 1) << 31) >> ((p) % 32))
! 61: #define BIT32R_TEST(b,p) ((b)[(p)/32] & BIT32R_VAL(p))
! 62: #define BIT32R_SET(b,p) ((b)[(p)/32] |= BIT32R_VAL(p))
! 63: #define BIT32R_CLR(b,p) ((b)[(p)/32] &= ~BIT32R_VAL(p))
! 64: #define BIT32R_ZERO(b,l) memset((b), 0, (l)/8)
! 65:
! 66: #ifndef NULL
! 67: #define NULL ((void *) 0)
! 68: #endif
! 69:
! 70: /* Macros for gcc attributes */
! 71:
! 72: #define NORET __attribute__((noreturn))
! 73: #define UNUSED __attribute__((unused))
! 74: #define PACKED __attribute__((packed))
! 75:
! 76: #ifndef HAVE_THREAD_LOCAL
! 77: #define _Thread_local
! 78: #endif
! 79:
! 80: /* Microsecond time */
! 81:
! 82: typedef s64 btime;
! 83: //typedef s64 bird_clock_t;
! 84:
! 85: #define S_ * (btime) 1000000
! 86: #define MS_ * (btime) 1000
! 87: #define US_ * (btime) 1
! 88: #define TO_S /1000000
! 89: #define TO_MS /1000
! 90: #define TO_US /1
! 91:
! 92: #ifndef PARSER
! 93: #define S S_
! 94: #define MS MS_
! 95: #define US US_
! 96: #define NS /1000
! 97: #endif
! 98:
! 99: #define TIME_INFINITY ((s64) 0x7fffffffffffffff)
! 100:
! 101:
! 102: /* Rate limiting */
! 103:
! 104: struct tbf {
! 105: btime timestamp; /* Last update */
! 106: u64 count; /* Available micro-tokens */
! 107: u16 burst; /* Max number of tokens */
! 108: u16 rate; /* Rate of replenishment (tokens / sec) */
! 109: u32 drop; /* Number of failed request since last successful */
! 110: };
! 111:
! 112: /* Default TBF values for rate limiting log messages */
! 113: #define TBF_DEFAULT_LOG_LIMITS { .rate = 1, .burst = 5 }
! 114:
! 115: int tbf_limit(struct tbf *f);
! 116:
! 117:
! 118: /* Logging and dying */
! 119:
! 120: typedef struct buffer {
! 121: byte *start;
! 122: byte *pos;
! 123: byte *end;
! 124: } buffer;
! 125:
! 126: #define STACK_BUFFER_INIT(buf,size) \
! 127: do { \
! 128: buf.start = alloca(size); \
! 129: buf.pos = buf.start; \
! 130: buf.end = buf.start + size; \
! 131: } while(0)
! 132:
! 133: #define LOG_BUFFER_INIT(buf) \
! 134: STACK_BUFFER_INIT(buf, LOG_BUFFER_SIZE)
! 135:
! 136: #define LOG_BUFFER_SIZE 1024
! 137:
! 138: #define log log_msg
! 139: void log_commit(int class, buffer *buf);
! 140: void log_msg(const char *msg, ...);
! 141: void log_rl(struct tbf *rl, const char *msg, ...);
! 142: void die(const char *msg, ...) NORET;
! 143: void bug(const char *msg, ...) NORET;
! 144:
! 145: #define L_DEBUG "\001" /* Debugging messages */
! 146: #define L_TRACE "\002" /* Protocol tracing */
! 147: #define L_INFO "\003" /* Informational messages */
! 148: #define L_REMOTE "\004" /* Remote protocol errors */
! 149: #define L_WARN "\005" /* Local warnings */
! 150: #define L_ERR "\006" /* Local errors */
! 151: #define L_AUTH "\007" /* Authorization failed etc. */
! 152: #define L_FATAL "\010" /* Fatal errors */
! 153: #define L_BUG "\011" /* BIRD bugs */
! 154:
! 155: void debug(const char *msg, ...); /* Printf to debug output */
! 156:
! 157: /* Debugging */
! 158:
! 159: #if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
! 160: #define DBG(x, y...) debug(x, ##y)
! 161: #else
! 162: #define DBG(x, y...) do { } while(0)
! 163: #endif
! 164:
! 165: #ifdef DEBUGGING
! 166: #define ASSERT(x) do { if (!(x)) bug("Assertion '%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
! 167: #else
! 168: #define ASSERT(x) do { if (!(x)) log(L_BUG "Assertion '%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
! 169: #endif
! 170:
! 171: #ifdef DEBUGGING
! 172: asm(
! 173: ".pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n"
! 174: ".byte 1\n" /* Python */
! 175: ".asciz \"bird-gdb.py\"\n"
! 176: ".popsection\n"
! 177: );
! 178: #endif
! 179:
! 180: /* Pseudorandom numbers */
! 181:
! 182: u32 random_u32(void);
! 183:
! 184: #endif
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