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Altera_Forum's avatar
Altera_Forum
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21 years ago

Using open and other HAL unix standard functions

How do I use them? The HAL manual says to include <unistd.h> but this doesn&#39;t work. The example code says to include <stdio.h> but never mentions unistd.h. Neither of these work for me. I can&#39...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Whenever I come upon a question of what headers to include, I hop onto a computer with a "real" OS (i.e.: *not* Windows!) and view the manpage of the function in question. In this case the top part of the manpage for "open", returns: 

SYNOPSIS
      # include <sys/types.h>
      # include <sys/stat.h>
      # include <fcntl.h>
       int open(const char *pathname, int flags);
       int open(const char *pathname, int flags, mode_t mode);
       int creat(const char *pathname, mode_t mode);

This tends to save me time and, since Windows documentation is a complete mess, it&#39;s much easier to find things on UNIX (or UNIX-like) OSs. If the documentation is wrong, it should certainly be updated, but I believe this little bit of info. to "common" knowledge... The two manpages I looked at (on Linux and Solaris) both had identical information.

Cheers,

- slacker