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OPEN(2)								       OPEN(2)

NAME
       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, ter‐
       minated 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 nec‐
       essary  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)

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