tmpfile(3p) [centos man page]

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

PROLOG

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

NAME

       tmpfile - create a temporary file

SYNOPSIS

       #include <stdio.h>

       FILE *tmpfile(void);

DESCRIPTION

       The tmpfile() function shall create a temporary file and open a corresponding stream. The file shall be automatically deleted when all ref-
       erences to the file are closed. The file is opened as in fopen() for update (w+).

       In  some  implementations,  a permanent file may be left behind if the process calling tmpfile() is killed while it is processing a call to
       tmpfile().

       An error message may be written to standard error if the stream cannot be opened.

RETURN VALUE

       Upon successful completion, tmpfile() shall return a pointer to the stream of the file that is created. Otherwise, it shall return  a  null
       pointer	and set errno to indicate the error.

ERRORS

       The tmpfile() function shall fail if:

       EINTR  A signal was caught during tmpfile().

       EMFILE {OPEN_MAX} file descriptors are currently open in the calling process.

       ENFILE The maximum allowable number of files is currently open in the system.

       ENOSPC The directory or file system which would contain the new file cannot be expanded.

       EOVERFLOW
	      The file is a regular file and the size of the file cannot be represented correctly in an object of type off_t.

       The tmpfile() function may fail if:

       EMFILE {FOPEN_MAX} streams are currently open in the calling process.

       ENOMEM Insufficient storage space is available.

       The following sections are informative.

EXAMPLES

   Creating a Temporary File
       The following example creates a temporary file for update, and returns a pointer to a stream for the created file in the fp variable.

	      #include <stdio.h>
	      ...
	      FILE *fp;

	      fp = tmpfile ();

APPLICATION USAGE

       It  should  be  possible  to open at least {TMP_MAX} temporary files during the lifetime of the program (this limit may be shared with tmp-
       nam()) and there should be no limit on the number simultaneously open other than this limit and any limit on the number	of  open  files  (
       {FOPEN_MAX}).

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fopen(), tmpnam(), unlink(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003							       TMPFILE(3P)

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

PROLOG

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

NAME

       tempnam - create a name for a temporary file

SYNOPSIS

       #include <stdio.h>

       char *tempnam(const char *dir, const char *pfx);

DESCRIPTION

       The tempnam() function shall generate a pathname that may be used for a temporary file.

       The tempnam() function allows the user to control the choice of a directory. The dir argument points to the name of the directory in  which
       the file is to be created. If dir is a null pointer or points to a string which is not a name for an appropriate directory, the path prefix
       defined as P_tmpdir in the <stdio.h> header shall be used. If that directory is not accessible, an implementation-defined directory may	be
       used.

       Many applications prefer their temporary files to have certain initial letter sequences in their names. The pfx argument should be used for
       this. This argument may be a null pointer or point to a string of up to five bytes to be used as the beginning of the filename.

       Some implementations of tempnam() may use tmpnam() internally.  On such implementations, if called more than {TMP_MAX} times  in  a  single
       process, the behavior is implementation-defined.

RETURN VALUE

       Upon  successful completion, tempnam() shall allocate space for a string, put the generated pathname in that space, and return a pointer to
       it. The pointer shall be suitable for use in a subsequent call to free(). Otherwise, it shall return a null pointer and set errno to  indi-
       cate the error.

ERRORS

       The tempnam() function shall fail if:

       ENOMEM Insufficient storage space is available.

       The following sections are informative.

EXAMPLES

   Generating a Pathname
       The  following  example generates a pathname for a temporary file in directory /tmp, with the prefix file. After the filename has been cre-
       ated, the call to free() deallocates the space used to store the filename.

	      #include <stdio.h>
	      #include <stdlib.h>
	      ...
	      char *directory = "/tmp";
	      char *fileprefix = "file";
	      char *file;

	      file = tempnam(directory, fileprefix);
	      free(file);

APPLICATION USAGE

       This function only creates pathnames. It is the application's responsibility to create and remove the files. Between the time a pathname is
       created	and the file is opened, it is possible for some other process to create a file with the same name. Applications may find tmpfile()
       more useful.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fopen(), free(), open(), tmpfile(), tmpnam(), unlink(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003							       TEMPNAM(3P)