APUE 高级Io一章中的一个示例，代码如下： [code] #include o.h> #include #include #include #include o.h> int set_nonblock_flag(int fd, int value) { int oldflag = fcntl(fd, F_GETFL, 0); if(oldflag == -1) return -1; if(value != 0) oldflag |= ont color="red">o_nonblockont>; else oldflag &= ~o_...

apue介绍FIFo 时，提到关于open FIFo 时ont color="red">o_nonblockont>标志位对read()系统调用的影响 When we open a FIFo, the nonblocking flag (ont color="red">o_nonblockont>) affects what happens. In the normal case (ont color="red">o_nonblockont> not specified), an open for read-only blocks until some other process opens the FIFo for writing. Similarly, an open for write-only blocks until some other process opens the FIFo for reading. If ont color="red">o_nonblockont> is spe...

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