Mail Archives: djgpp/1999/07/09/05:40:03
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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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