#define evutil_timercmp(tvp, uvp, cmp)
//获取当前时间，timeval 是包含秒和微妙的结构体
int evutil_gettimeofday(struct timeval *tv, struct timezone *tz);
example:
struct timeval tv1, tv2, tv3;
/* Set tv1 = 5.5 seconds */
tv1.tv_sec = 5; tv1.tv_usec = 500*1000;
/* Set tv2 = now */
evutil_gettimeofday(&tv2, NULL);
/* Set tv3 = 5.5 seconds in the future */
evutil_timeradd(&tv1, &tv2, &tv3);
/* all 3 should print true */if (evutil_timercmp(&tv1, &tv1, ==)) /* == "If tv1 == tv1" */
puts("5.5 sec == 5.5 sec");
if (evutil_timercmp(&tv3, &tv2, >=)) /* == "If tv3 >= tv2" */
puts("The future is after the present.");
if (evutil_timercmp(&tv1, &tv2, <)) /* == "If tv1 < tv2" */
兼容的socket API
int evutil_closesocket(evutil_socket_t s);
#define EVUTIL_CLOSESOCKET(s) evutil_closesocket(s)
#define EVUTIL_SOCKET_ERROR()
#define EVUTIL_SET_SOCKET_ERROR(errcode)
#define evutil_socket_geterror(sock)
#define evutil_socket_error_to_string(errcode)
int evutil_make_socket_nonblocking(evutil_socket_t sock);
int evutil_make_socket_closeonexec(evutil_socket_t sock);
int evutil_socketpair(int family, int type, int protocol,
evutil_socket_t sv[2]);
方便的字符串操作函数
ev_int64_t evutil_strtoll(const char *s, char **endptr, int base);
int evutil_snprintf(char *buf, size_t buflen, const char *format, ...);
int evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap);
本地字符串操作函数
int evutil_ascii_strcasecmp(const char *str1, const char *str2);
int evutil_ascii_strncasecmp(const char *str1, const char *str2, size_t n);
IPV6 相关函数
const char *evutil_inet_ntop(int af, const void *src, char *dst, size_t len);
int evutil_inet_pton(int af, const char *src, void *dst);
int evutil_parse_sockaddr_port(const char *str, struct sockaddr *out,
int *outlen);
int evutil_sockaddr_cmp(const struct sockaddr *sa1,
const struct sockaddr *sa2, int include_port);
方便的结构宏
#define evutil_offsetof(type, field) /* ... */
安全的随机数发生器
void evutil_secure_rng_get_bytes(void *buf, size_t n);
int evutil_secure_rng_init(void);
void evutil_secure_rng_add_bytes(const char *dat, size_t datlen);
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