Linux编程常用函数总结

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1.打印日志函数

#include <stdarg.h>#define SPIDER_LOG(level, format, ...) do{ \    if (level >= g_conf->log_level) {\        time_t now = time(NULL); \        char msg[MAX_MESG_LEN]; \        char buf[32]; \        sprintf(msg, format, ##__VA_ARGS__); \        strftime(buf, sizeof(buf), "%Y%m%d %H:%M:%S", localtime(&now)); \        fprintf(stdout, "[%s] [%s] %s\n", buf, LOG_STR[level], msg); \        fflush(stdout); \    } \    if (level == SPIDER_LEVEL_ERROR) {\        exit(-1); \    } \} while(0)

函数调用：

SPIDER_LOG(SPIDER_LEVEL_WARN, "limit should NOT be greater than %lu", rl.rlim_max);//（其中#define SPIDER_LEVEL_WARN  2）

2.设置进程最多打开的文件数

static int set_nofile(rlim_t limit){    struct rlimit rl;    if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {        SPIDER_LOG(SPIDER_LEVEL_WARN, "getrlimit fail");        return -1;    }    if (limit > rl.rlim_max) {        SPIDER_LOG(SPIDER_LEVEL_WARN, "limit should NOT be greater than %lu", rl.rlim_max);        return -1;    }    rl.rlim_cur = limit;    if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {        SPIDER_LOG(SPIDER_LEVEL_WARN, "setrlimit fail");        return -1;    }    return 0;}

函数调用：

set_nofile(1024);

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