int open file in c
#include <unistd.h>
#include <fcntl.h>
int main()
{
int filedesc = open("testfile.txt", O_WRONLY | O_APPEND);
if(filedesc < 0)
return 1;
if(write(filedesc,"This will be output to testfile.txt\n", 36) != 36)
{
write(2,"There was an error writing to testfile.txt\n"); // strictly not an error, it is allowable for fewer characters than requested to be written.
return 1;
}
return 0;
}