file - negative return value in Open system call; C -

i have created file in /proc named "test" (it created in kernel). file exists. when want open in user level returns negative.

int fd; if((fd=open("/proc/test","o_rdonly"))<0){        perror("open");  } 

the error see open: file exists. have seen this question not case.

you need parentheses in there (now fixed in question), , second argument open() not string:

#include <fcntl.h>  int fd; if ((fd = open("/proc/test", o_rdonly)) < 0)     perror("open"); 

i'm not convinced idea create file of sort in /proc file system. in fact, i'm bit surprised allowed to. if learning program root, hope have backups.