tmpnam(3)						     Library Functions Manual							 tmpnam(3)

NAME

       tmpnam, tempnam -  Construct the name for a temporary file

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <stdio.h>

       char *tmpnam(
	       char *s);

       char *tempnam(
	       const char *directory,
	       const char *prefix);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       tmpnam(), tempnam():  XSH4.2

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies  the  address	of  an array of at least the number of bytes specified by L_tmpnam, a constant defined in the stdio.h header file.
       Points to the pathname of the directory in which the file is to be created.  Points to an initial letter sequence with which  the  filename
       begins.	The  prefix parameter can be null, or it can point to a string of up to 5 bytes to be used as the beginning of the temporary file-
       name.

DESCRIPTION

       The tmpnam() and tempnam() functions generate filenames for temporary files.

       The tmpnam() function generates a filename using the pathname defined as P_tmpdir in the stdio.h header file.

       Files created using this function reside in a directory intended for temporary use, and their names are unique.	It  is	the  application's
       responsibility to use the unlink() function to remove the files when they are no longer needed.

       Between	the  time a filename is created and the file is opened, it is possible for some other process to create a file with the same name.
       This should not happen if that other process uses these functions or the mktemp() function, and if the filenames are chosen to make  dupli-
       cation by other means unlikely.

       The  tempnam()  function  allows you to control the choice of a directory. If the directory parameter is null or points to a string that is
       not a pathname for an appropriate directory, the pathname defined as P_tmpdir in the stdio.h header file is used. If that pathname  is  not
       accessible,  /tmp  is used. You can bypass the selection of a pathname by providing an environment variable, TMPDIR, in the user's environ-
       ment.  The value of the TMPDIR variable is a pathname for the desired temporary file directory.

       The prefix parameter can be used to specify a prefix of up to 5 bytes for the temporary filename.

NOTES

       If the s parameter is null, the tmpnam() function places its result into an internal thread-specific buffer and returns a pointer  to  that
       area.  Subsequent calls to this function from the same thread overwrite this buffer.

       The tmpnam() function generates a different filename each time it is called.

       [Tru64 UNIX]  If tmpnam() is called more than TMP_MAX times by a single process, it starts recycling previously used names.

RETURN VALUES

       If the s parameter is null, tmpnam() function places its result into an internal thread-specific buffer and returns a pointer to that area.

       If  the s parameter is not null, it is assumed to be the address of an array of at least the number of bytes specified by the L_tmpnam con-
       stant.  The tmpnam() function places its results into that array and returns the value of the s parameter.

       Upon successful completion, the tempnam() function returns a pointer to the generated pathname, suitable for use in a  subsequent  call	to
       the free() function.  Otherwise, null is returned and errno is set to indicate the error.

ERRORS

       If the tempnam() function fails, errno may be set to the following value: Insufficient storage space is available.

RELATED INFORMATION

       Functions: fopen(3), free(3), malloc(3), mktemp(3), open(2), tmpfile(3), unlink(2)

       Standards: standards(5) delim off

																	 tmpnam(3)