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Identifiers with external linkage include setjmp, errno, math_errhandling, va_end.
In the example errno is defined. The errno value set by the function open() would not be accessible to the program as its definition is suppressed. For information regarding redefining errno, see ERR31-C. Don't redefine errno.
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#include <errno.h>
#define errno 200
int validate(unsigned int secretValue){
char fname[] = "non_exist.txt";
int fd;
int result = -1;
fd = open(fname, O_RDONLY);
if(fd == -1){
printf("Error opening file. Error code : %d\n", errno);
return result;
}
close(fd);
if(errno % secretValue == 20){
result = 0;
}
else{
result = -1;
}
return result;
}
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