LIBMAKETMPFILEFD(3)

✨ LIBMAKETMPFILEFD(3) ✨

okay bestie, we're in the Netpbm corner of the library functions manual, and today's main character is pm_make_tmpfile_fd() 🎀 yes it's a library function, yes it lives in section 3, and yes it's about to be your new fave for making temp files. sit down, grab a strawberry 🍓, let's go.

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💖 NAME 💖

pm_make_tmpfile_fd() — create a temporary named file 🦋

literally that's the whole job. make a temp file. give it a name. slay.

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🌸 SYNOPSIS 🌸

#include <netpbm/pm.h>

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

that's the whole vibe, no cap. 🫶

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✨ EXAMPLE ✨

okay so 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. iconic behaviour honestly 💅

#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);

not me reading this and being like "okay yes, clean up after yourself, queen" 🧹✨ unlink the file, strfree the name, periodt.

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🌈 DESCRIPTION 🌈

so this library function is part of Netpbm(1). yes, that Netpbm. the whole family. 💜

pm_make_tmpfile_fd() is analogous to pm_make_tmpfile()(1). the only difference is that it opens the file as a low level file, the way open() would, rather than as a stream, the way fopen() would. that's it. that's the whole plot twist 🔥

if you don't actually need to access the file by name, bestie, 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, even if your program failed to clean up after itself. main character energy from the OS fr fr 👑

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🦋 HISTORY 🦋

pm_tmpfile() was introduced in Netpbm 10.42 (March 2008). so it's a little vintage, a little classic, still serving. ⭐

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🎀 DOCUMENT SOURCE 🎀

this manual page was generated by the Netpbm tool makeman from HTML source. the master documentation lives at:

http://netpbm.sourceforge.net/doc/libmaketmpfilefd.html

go peek if you want the source of truth, iykyk 💖

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and that's the whole page, bestie!! 🫶 brought to you by the netpbm documentation, dated 31 December 2007, closing out this Netpbm section 3 library function manual like the absolute icon it is. mwah 💋 ✨