Message-ID: <3785A4D2.398B0B27@accord-soft.com>
Date: Fri, 09 Jul 1999 12:59:22 +0530
From: Sunil V <sunilv AT accord-soft DOT com>
Organization: Accord Software & Systems Pvt. Ltd.
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To: djgpp AT delorie DOT com
Subject: Re: File opening error
References: <F821915ECD30D3119CC3005004267603065BF3 AT spzmg01 DOT spzexch01>
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Poonam Jain wrote:

> I was trying to execute the code developed and compiled in RHIDE.
> Application was giving error while opening the file(say temp.dat)  in write
> mode, though the file exists.

The application worked well when I used just O_WRONLY.  coz' O_WRONLY opens file
for writing. Hence assumes that file exists.

> So I changed the file opening mode from
> O_WRONLY to O_WRONLY|O_CREAT, deleted the file(say temp.dat).Executed the
> changed code. First time it runs fine  but on executing it for the second
> time, encountered file opening error in write mode.
> What can be the possible reason ??

Instead what u can do is use only O_CREAT and everything works fine.

>
> Below is the piece of code, I was trying to execute. Is there anything wrong
> in the code??
>
> #include<stdio.h>
> #include<unistd.h>
> #include<fcntl.h>
> #include<sys/stat.h>
> typedef struct
> {
>  int magic;
>  char c;
> }test_struct;
>
> main()
> {
> int fd;
> test_struct test;
> test_struct in_data,out_data;
>
>     _fmode=O_BINARY;
>     in_data.magic=10;
>     in_data.c='A';
>
>     if(( fd = open("temp.dat", O_WRONLY)) < 0)
>        {
>        printf("Not able to open the file for writing \n");
>        return;
>        }
>
>    write(fd,&in_data,sizeof(in_data));
>    close(fd);
>
>    if(( fd = open("temp.dat", O_RDONLY)) < 0)
>       {
>       printf("Not able to open the file for reading \n");
>       return;
>       }
>    read(fd,&out_data,sizeof(out_data));
>    close(fd);
>    printf("Output magic %d  and char  %c \n",out_data.magic,out_data.c);
>
> }
>
> Regards
> Poonam

--
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Imagination is more important than knowledge.
    - Albert Einstein
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