Flags for syscall open

Description

The following table lists the file control flags used with the open(2) system call, along with their octal and hexadecimal values. These flags are used to define the access mode and behavior of a file descriptor.

List of flags

Flag Name	Octal Value	Hexadecimal Value
O_RDONLY	0o00	0x00
O_WRONLY	0o01	0x01
O_RDWR	0o02	0x02
O_CREAT	0o100	0x40
O_EXCL	0o200	0x80
O_NOCTTY	0o400	0x100
O_TRUNC	0o1000	0x200
O_APPEND	0o2000	0x400
O_NONBLOCK	0o4000	0x800
O_NDELAY	0o4000	0x800
O_ASYNC	0o20000	0x2000
O_SYNC	0o4010000	0x401000
O_FSYNC	0o4010000	0x401000