CREAT(2-SVR4) RISC/os Reference Manual CREAT(2-SVR4)
NAME
creat - create a new file or rewrite an existing one
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int creat(const char *path, modet mode);
DESCRIPTION
creat creates a new ordinary file or prepares to rewrite an
existing file named by the path name pointed to by path.
If the file exists, the length is truncated to 0 and the
mode and owner are unchanged.
If the file does not exist the file's owner ID is set to the
effective user ID of the process. The group ID of the file
is set to the effective group ID of the process, or if the
S_ISGID bit is set in the parent directory then the group ID
of the file is inherited from the parent directory. The
access permission bits of the file mode are set to the value
of mode modified as follows:
If the group ID of the new file does not match the
effective group ID or one of the supplementary group
IDs, the S_ISGID bit is cleared.
All bits set in the process's file mode creation mask
are cleared [see umask(2)].
The save text image after execution bit of the mode is
cleared [see chmod(2) for the values of mode].
Upon successful completion, a write-only file descriptor is
returned and the file is open for writing, even if the mode
does not permit writing. The file pointer is set to the
beginning of the file. The file descriptor is set to remain
open across exec system calls [see fcntl(2)]. A new file
may be created with a mode that forbids writing.
The call creat(path, mode) is equivalent to:
open(path, O_WRONLY | O_CREAT | O_TRUNC, mode)
creat fails if one or more of the following are true:
EACCES Search permission is denied on a com-
ponent of the path prefix.
EACCES The file does not exist and the
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CREAT(2-SVR4) RISC/os Reference Manual CREAT(2-SVR4)
directory in which the file is to be
created does not permit writing.
EACCES The file exists and write permission is
denied.
EAGAIN The file exists, mandatory file/record
locking is set, and there are outstand-
ing record locks on the file [see
chmod(2)].
EFAULT path points outside the allocated
address space of the process.
EISDIR The named file is an existing directory.
EINTR A signal was caught during the creat
system call.
ELOOP Too many symbolic links were encountered
in translating path.
EMFILE The process has too many open files [see
getrlimit(2)].
ENAMETOOLONG The length of the path argument exceeds
{PATH_MAX}, or the length of a path com-
ponent exceeds {NAME_MAX} while
_POSIX_NO_TRUNC is in effect.
ENOTDIR A component of the path prefix is not a
directory.
ENOENT A component of the path prefix does not
exist.
ENOENT The path name is null.
EROFS The named file resides or would reside
on a read-only file system.
ETXTBSY The file is a pure procedure (shared
text) file that is being executed.
ENFILE The system file table is full.
ENOLINK path points to a remote machine and the
link to that machine is no longer
active.
EMULTIHOP Components of path require hopping to
multiple remote machines.
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CREAT(2-SVR4) RISC/os Reference Manual CREAT(2-SVR4)
ENOSPC The file system is out of inodes.
SEE ALSO
chmod(2), close(2), dup(2), fcntl(2), getrlimit(2),
lseek(2), open(2), read(2), umask(2), write(2), stat(5).
DIAGNOSTICS
Upon successful completion a non-negative integer, namely
the lowest numbered unused file descriptor, is returned.
Otherwise, a value of -1 is returned, no files are created
or modified, and errno is set to indicate the error.
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