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open(2) [v7 man page]

OPEN(2) 							System Calls Manual							   OPEN(2)

open - open for reading or writing SYNOPSIS
open(name, mode) char *name; DESCRIPTION
Open opens the file name for reading (if mode is 0), writing (if mode is 1) or for both reading and writing (if mode is 2). Name is the address of a string of ASCII characters representing a path name, terminated by a null character. The file is positioned at the beginning (byte 0). The returned file descriptor must be used for subsequent calls for other input-output functions on the file. SEE ALSO
creat(2), read(2), write(2), dup(2), close(2) DIAGNOSTICS
The value -1 is returned if the file does not exist, if one of the necessary directories does not exist or is unreadable, if the file is not readable (resp. writable), or if too many files are open. ASSEMBLER
(open = 5.) sys open; name; mode (file descriptor in r0) OPEN(2)

Check Out this Related Man Page

CREAT(2)							System Calls Manual							  CREAT(2)

creat - create a new file SYNOPSIS
creat(name, mode) char *name; DESCRIPTION
Creat creates a new file or prepares to rewrite an existing file called name, given as the address of a null-terminated string. If the file did not exist, it is given mode mode, as modified by the process's mode mask (see umask(2)). Also see chmod(2) for the construction of the mode argument. If the file did exist, its mode and owner remain unchanged but it is truncated to 0 length. The file is also opened for writing, and its file descriptor is returned. The mode given is arbitrary; it need not allow writing. This feature is used by programs which deal with temporary files of fixed names. The creation is done with a mode that forbids writing. Then if a second instance of the program attempts a creat, an error is returned and the program knows that the name is unusable for the moment. SEE ALSO
write(2), close(2), chmod(2), umask (2) DIAGNOSTICS
The value -1 is returned if: a needed directory is not searchable; the file does not exist and the directory in which it is to be created is not writable; the file does exist and is unwritable; the file is a directory; there are already too many files open. ASSEMBLER
(creat = 8.) sys creat; name; mode (file descriptor in r0) CREAT(2)
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