Creat create a file #include <modes.h> creat char *fname int perm os9 I$CREATE Creat returns a path number to a new file available for writing, giving it the permissions specified in "perm" and making the task user the owner. If, however, "fname" is the name of an existing file, the file is truncated to zero length, and the ownership and permissions remain unchanged. NOTE, that unlike the OS-9 assembler service request, creat does not return an error if the file already exists. "Access()" should be used to establish the existence of a file if it is important that a file should not be overwritten. It is unnecessary to specify writing permissions in "perm" in order to write to the file in the current task. The permissions allowed are defined in the include file as follows: #define S_IPRM 0xff /* mask for permission bits */ #define S_IREAD 0x01 /* owner read */ #define S_IWRITE 0x02 /* owner write */ #define S_IEXEC 0x04 /* owner execute */ #define S_IOREAD 0x08 /* public read */ #define S_IOWRITE 0x10 /* public write */ #define S_IOEXEC 0x20 /* public execute */ #define S_ISHARE 0x40 /* sharable */ Directories may not be created with this call; use "mknod()" instead. This call returns -1 if there are too many files open. If the pathname cannot be searched, if permission to write is denied, or if the file exists and is a directory. write(), close(), chmod()