getopt(分析命令行参数)

#include <unistd.h>
int getopt(int argc, char * const argv[], const char *optstring);

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dlclose(关闭动态函数库文件)

#include <dlfcn.h>
int dlclose(void *handle);

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regcomp(编译正则表达式字符串)

#include <sys/types.h>
#include <regex.h>
int regcomp(regex_t *preg, const char *regex, int cflags);

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getenv(取得环境变量内容)

#include <stdlib.h>
char *getenv(const char *name);

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closelog(关闭信息记录)

#include <syslog.h>
void closelog(void);

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ftok(将文件路径和计划代号转为system vipckey)

#include <sys/types.h>
#include <sys/ipc.h>
key_t ftok(const char *pathname, int proj_id);

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accept(接受socket连线)

#include <sys/socket.h>
int accept(int socket, struct sockaddr *restrict address, socklen_t *restrict address_len);

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mkfifo(建立具名管道)

#include <sys/types.h>
#include <sys/stat.h>
int mkfifo(const char *pathname, mode_t mode);

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ferror(检查文件流是否有错误发生)

#include <stdio.h>
int ferror(FILE *stream);

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alarm(设置信号传送闹钟)

#include <unistd.h>
unsigned int alarm(unsigned int seconds);

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