best way to insert a line at the top of a file?

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LEARN ABOUT LINUX

tmpfile

TMPFILE(3)						     Linux Programmer's Manual							TMPFILE(3)

NAME

       tmpfile - create a temporary file

SYNOPSIS

       #include <stdio.h>

       FILE *tmpfile(void);

DESCRIPTION

       The  tmpfile()  function  opens a unique temporary file in binary read/write (w+b) mode.  The file will be automatically deleted when it is
       closed or the program terminates.

RETURN VALUE

       The tmpfile() function returns a stream descriptor, or NULL if a unique filename cannot be generated or the unique file cannot  be  opened.
       In the latter case, errno is set to indicate the error.

ERRORS

       EACCES Search permission denied for directory in file's path prefix.

       EEXIST Unable to generate a unique filename.

       EINTR  The call was interrupted by a signal.

       EMFILE Too many file descriptors in use by the process.

       ENFILE Too many files open in the system.

       ENOSPC There was no room in the directory to add the new filename.

       EROFS  Read-only file system.

CONFORMING TO

       SVr4, 4.3BSD, C89, C99, SUSv2, POSIX.1-2001.

NOTES

       POSIX.1-2001 specifies: an error message may be written to stdout if the stream cannot be opened.

       The  standard does not specify the directory that tmpfile() will use.  Glibc will try the path prefix P_tmpdir defined in <stdio.h>, and if
       that fails the directory /tmp.

SEE ALSO

       exit(3), mkstemp(3), mktemp(3), tempnam(3), tmpnam(3)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2008-07-14								TMPFILE(3)

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