unistd.h详细内容

//unistd.h在unix中类似于Window中的windows.h!

#ifdef WIN32

#include

#else

#include

#endif



unistd.h含有的常量与函数：

ssize_t        read(int, void *,size_t);

ssize_t        write(int, const void *,size_t);

int                 unlink(const char *);

int       usleep(useconds_t);

unsigned    sleep(unsigned);



int          access(const char *, int);
unsigned     alarm(unsigned);
int          chdir(const char *);
int          chown(const char *, uid_t, gid_t);
int          close(int);
size_t      confstr(int, char *, size_t);
void        _exit(int);
pid_t        fork(void);


NULL                      // Null pointer

SEEK_SET      0   // Set file offset to offset.                           
SEEK_CUR    1   // Set file offset to current plus offset.
SEEK_END     2  // Set file offset to EOF plus offset.