libmaketmpfilefd (3) - Linux Manuals

libmaketmpfilefd: create a temporary named file

NAME

pm_make_tmpfile_fd() - create a temporary named file

SYNOPSIS

#include <netpbm/pm.h>

pm_make_tmpfile(int *         fdP,
                const char ** filenameP);

EXAMPLE

This simple example creates a temporary file, writes 'hello world' to it, then writes some search patterns to it, then uses it as input to grep:

#include <netpbm/pm.h>

int fd;
const char * myfilename;

pm_make_tmpfile_fd(&fdP, &myfilename);

write(fd, '^account:\\s.*\n', 16);
fprintf(fd, '^name:\\s.*\n', 13);

close(fd);

asprintfN(&grepCommand, 'grep --file='%s' /tmp/infile >/tmp/outfile');

system(grepCommand);

strfree(grepCommand);

unlink(myfilename);

strfree(myfilename);

DESCRIPTION

This library function is part of Netpbm(1)

pm_make_tmpfile_fd() is analogous to pm_make_tmpfile()(1) difference is that it opens the file as a low level file, as open() would, rather than as a stream, as fopen() would.

If you don't need to access the file by name, use pm_tmpfile_fd() instead, because it's cleaner. With pm_tmpfile_fd(), the operating system always deletes the temporary file when your program exits, if the program failed to clean up after itself.

HISTORY

pm_tmpfile() was introduced in Netpbm 10.42 (March 2008).