The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> creat - create a new file or rewrite an existing one

#### SYNOPSIS

> ``[OH] #include <sys/stat.h> #include <fcntl.h>
> int creat(const char *`path`, mode_t` mode`);
> ``

#### DESCRIPTION

> The creat() function shall behave as if it is implemented as follows:

>     int creat(const char *path, mode_t mode)
>     {
>         return open(path, O_WRONLY|O_CREAT|O_TRUNC, mode);
>     }

#### RETURN VALUE

> Refer to open.

#### ERRORS

> Refer to open.

The following sections are informative.

#### EXAMPLES

> ##### Creating a File

> The following example creates the file /tmp/file with read and write permissions for the file owner and read permission for group and others. The resulting file descriptor is assigned to the fd variable.

>     #include <fcntl.h>
>     ...
>     int fd;
>     mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
>     char *pathname = "/tmp/file";
>     ...
>     fd = creat(pathname, mode);
>     ...

#### APPLICATION USAGE

> None.

#### RATIONALE

> The creat() function is redundant. Its services are also provided by the open() function. It has been included primarily for historical purposes since many existing applications depend on it. It is best considered a part of the C binding rather than a function that should be provided in other languages.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> mknod, open

> XBD <fcntl.h>, <sys/stat.h>, <sys/types.h>

#### CHANGE HISTORY

> First released in Issue 1. Derived from Issue 1 of the SVID.

#### Issue 6

> In the SYNOPSIS, the optional include of the <sys/types.h> header is removed.

> The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:

> - The requirement to include <sys/types.h> has been removed. Although <sys/types.h> was required for conforming implementations of previous POSIX specifications, it was not required for UNIX applications.

#### Issue 7

> SD5-XSH-ERN-186 is applied.

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0064 [291] is applied.

End of informative text.

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