open file linux eclipse c error after getchld - c

Question

im just trying to open a file.
i have done it for 100 times, and then I sent SIGCHLD signal to other processes and i think right after that i couldn't open that file anymore.
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#define FLAGS IPC_CREAT | 0644
int main() {
int res =open("results.txt",FLAGS);
if(res== -1) { printf("error!!")} //prints it every time
return 0;}
..it suddenly just happened.. help ???

Answer 1

You're doing something strange with the flags. I think your intention is as per below code:
#define FLAGS O_CREAT
#define MODE 0644
int main()
{
int res =open("results.txt",FLAGS,MODE);
if(res== -1) { printf("error!!");} //prints it every time
return 0;
}

Answer 2

the following code:
cleanly compiles
properly calls the open() function
properly displays the error message
does not #include header files that are not used
consistently indents the code
follows the axiom: `only one statement per line and (at most) one variable declaration per statement.
separates code blocks (for, if ,else, while, do...while, switch, case, default) via a blank line
uses a proper signature for the main() function (the empty parens in the posted code means that any number of parameters, including 0 parameters, are allowed
code should not return 0 success when an error occurs so using exit( EXIT_FAILURE )
And now the code:
#include <stdio.h> // perror()
#include <stdlib.h> // exit(), EXIT_FAILURE
#include <unistd.h> // open()
#include <fcntl.h> // O_CREAT
#define FLAGS O_CREAT
#define MODE 0644
int main( void )
{
int res =open("results.txt", FLAGS, MODE);
if(res== -1)
{
perror( "open for results.txt failed" );
exit( EXIT_FAILURE );
}
return 0;
}