C Programming/POSIX Reference/fcntl.h
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fcntl.h is the header in the C POSIX library for the C programming language that contains constructs that refer to file control, e.g. opening a file, retrieving and changing the permissions of file, locking a file for edit, etc.
int fcntl(int __fd, int __cmd, ...)
int open(char* pathname, int flags, ...);
int creat(const char *,int);