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Asked: 2026-05-18T03:03:30+00:00

I’m using ioctl() to check if the read-end of a pipe would block. I

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I’m using ioctl() to check if the read-end of a pipe would block. I set ioctl(the_pipe[0], FIONBIO, ...) (I’m not sure what the 3rd parameter is supposed to be, can I set it to NULL?).

As I understand, read(the_pipe[0], buf, buf_len); is supposed to set an error code for EWOULDBLOCK (EAGAIN), but where is that error code set, how do I get it?

Thanks

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1 Answer

  1. Editorial Team

    errno is available after having included errno.h

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