我使用的是serial port,在与此通信时,我必须使用tcsetattr()和TCSDRAIN模式更改配置。
TCSADRAIN
The change should take place after all output written to fd has been read by the master pseudoterminal. Use this value when changing terminal attributes that affect output.
当使用tcsetattr()调用TCSDRAIN时,如果缓冲区中仍然保留输出数据,则Linux似乎被阻塞,并在中
我想要生成一个排序列表与所有8位数字-从00000000到99999999。我输入了shell:
f() {
while IFS="" read -r line; do
for i in {0..9}; do
echo "$line$i";
done;
done
}
echo | f | f | f | f | f | f | f | f | tee result.txt | wc -l
反应是
bash: echo: write error: Interrupted system call
bash: echo: write
我在Linux中实现了一个类似FTP的协议(家庭作业),我遇到了以下问题:在另一端设法做accept()之前,客户端可能能够连接()和write() (但在它做了listen()之后)。如果不依赖于在不同的通信通道中传递"accept succeeded,you can now write“这样的消息,我如何才能阻止写操作的工作?
如何在linux管道上设置写()的超时?
示例代码:
int fd_pipe = open("/run/some/pipe", O_RDWR);
// here i need to set timeout for 3 seconds somehow, if can't write, code will continue...
write(fd_pipe, something, strlen(something));
// continue executing..
谢谢
我刚刚观察到,在二元结构中,失速现象非常罕见。
将gdb附加到相关线程并切换到相应线程
(gdb) bt
#0 0x000000330a4db79d in write () from /lib64/libc.so.6
#1 0x000000330a471dd3 in _IO_new_file_write () from /lib64/libc.so.6
#2 0x000000330a473385 in _IO_new_do_write () from /lib64/libc.so.6
#3 0x000000330a4726df in _IO_new_file_overflow () f
下面是示例程序:
from = File.open('test.bin', 'rb')
to = IO.popen('cat', 'w+b')
i = 0
while buff = from.read(4096)
to.write(buff) # blocks here
i += 1
print "#{i}, #{buff.size} bytes read \r"
end
它读取二进制文件(您可以在Linux上使用fallocate -l 1MB test.bin创建它)
昨天我把一个11.10盒升级到12.04。今天上午,我尝试运行apt-get升级程序,并遇到以下情况:
sudo apt-get upgrade
[sudo] password for brian:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
linux-generic linux-headers-generic linux-image-generic
T