unistd接口介绍
需要包含头文件#include <posix/unistd.h>;
定义了系统sleep相关的接口
Header File
Functions
-
unsigned sleep(unsigned seconds)
Suspend execution for an interval of time.
http://pubs.opengroup.org/onlinepubs/9699919799/functions/sleep.html
备注
Return value of a positive number is not yet supported.
- 参数
seconds – [in] The number of seconds to suspend execution.
- Return values
0 – - Upon successful completion.
-
int usleep(useconds_t usec)
Suspend execution for microsecond intervals.
This is a useful, non-POSIX function.
- 参数
usec – [in] The number of microseconds to suspend execution.
- Return values
0 – - Upon successful completion.