From:	Martin Str|mberg <ams AT ludd DOT luth DOT se>
Message-Id:	<200102112000.VAA19068@father.ludd.luth.se>
Subject:	Re: preserve errno in open patch
In-Reply-To:	<3A869A94.27606.A30709@localhost> from "Mark E." at "Feb 11, 2001 01:58:44 pm"
To:	djgpp-workers AT delorie DOT com
Date:	Sun, 11 Feb 2001 21:00:54 +0100 (MET)
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According to Mark E.:
> Hi,
> 
> 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;
> }

In general, it's wrong to look at errno unless you've got error
indication from the system call. Hence the program works as expected.



Right,

						MartinS

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