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I use "((ptr = creat (filename, S_IWGRP)) == -1) and it works.
Thanks.

Hi
I want to write to my output_file using:

if((fptr = creat(output_file, _S_IWRITE)) == -1)
{
printf("output_file..."..);
return (1);
}
for(...)
{
_write(fptr, buffer, BUF_SIZE);
}...