Date: Sun, 11 Feb 2001 21:23:26 +0200
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: "Mark E." <snowball3 AT bigfoot DOT com>
Message-Id: <8011-Sun11Feb2001212326+0200-eliz@is.elta.co.il>
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CC: djgpp-workers AT delorie DOT com
In-reply-to: <3A869A94.27606.A30709@localhost> (snowball3@bigfoot.com)
Subject: Re: preserve errno in open patch
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> From: "Mark E." <snowball3 AT bigfoot DOT com>
> Date: Sun, 11 Feb 2001 13:58:44 -0500
> 
> This program prints out a "file not found" message even when fd != -1.
> 
> #include <fcntl.h>
> #include <stdlib.h>
> #include <sys/stat.h>
> #include <errno.h>
> 
> int main()
> {
>   int fd;
> 
>   fd = open("file", O_RDWR | O_CREAT | O_TRUNC, S_IWUSR);
> 
>   if (errno)
>     perror("file");
> 
>   close(fd);
> 
>   return 0;
> }

This is not a bug: `open' is not an atomic system call, so it is
perfectly valid for it to set errno to something non-zero.

That said, I have no objections to the change, if it useful in some
situation.