creat(3p) — Linux manual page

CREAT(3P)               POSIX Programmer's Manual              CREAT(3P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

NAME         top

       creat — create a new file or rewrite an existing one

SYNOPSIS         top

       #include <sys/stat.h>
       #include <fcntl.h>

       int creat(const char *path, mode_t mode);

DESCRIPTION         top

       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         top

       Refer to open(3p).

ERRORS         top

       Refer to open(3p).

       The following sections are informative.

EXAMPLES         top

   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         top

       None.

RATIONALE         top

       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         top

       None.

SEE ALSO         top

       mknod(3p), open(3p)

       The Base Definitions volume of POSIX.1‐2017, fcntl.h(0p),
       sys_stat.h(0p), sys_types.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any
       discrepancy between this version and the original IEEE and The
       Open Group Standard, the original IEEE and The Open Group
       Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                         CREAT(3P)

Pages that refer to this page: fcntl.h(0p),  pax(1p),  touch(1p),  fchmod(3p),  fopen(3p),  fstatvfs(3p),  lockf(3p),  mknod(3p),  open(3p),  posix_fallocate(3p),  umask(3p),  write(3p)

HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.