在Python中,fcntl
模块用于文件描述符的控制操作
import os
import fcntl
def set_nonblocking(file_descriptor):
try:
flags = fcntl.fcntl(file_descriptor, fcntl.F_GETFL)
fcntl.fcntl(file_descriptor, fcntl.F_SETFL, flags | os.O_NONBLOCK)
except IOError as e:
print(f"Error setting file descriptor to non-blocking: {e}")
return False
return True
def is_nonblocking(file_descriptor):
try:
flags = fcntl.fcntl(file_descriptor, fcntl.F_GETFL)
return flags & os.O_NONBLOCK != 0
except IOError as e:
print(f"Error checking if file descriptor is non-blocking: {e}")
return False
# Example usage
file_descriptor = os.open("example.txt", os.O_RDONLY)
if set_nonblocking(file_descriptor):
print("File descriptor set to non-blocking")
else:
print("Failed to set file descriptor to non-blocking")
if is_nonblocking(file_descriptor):
print("File descriptor is non-blocking")
else:
print("File descriptor is not non-blocking")
os.close(file_descriptor)
在这个示例中,我们定义了两个函数:set_nonblocking
和is_nonblocking
。这两个函数都使用了try-except
语句来捕获可能的IOError
异常,并在发生异常时打印错误消息。这样,我们可以简化错误处理并确保在出现问题时能够给出有关错误的详细信息。