On Sat, Nov 27, 2010 at 05:07:15PM -0200, Carlos A. M. dos Santos wrote: > On Sat, Nov 27, 2010 at 3:18 PM, Dimitry Andric <[email protected]> wrote: > > On 2010-11-25 21:14, Xin LI wrote: > >> > >> For certain applications it is sometimes desirable to (e.g. for unix > >> domain sockets) have file removed when the process quit, regardless > >> whether the process is quit cleanly. Is there a clean way to do this? > > > > Maybe your process could be the child of a parent which cleans up > > afterwards? (This is an analogy from real life. ;) > > #include <stdio.h> > #include <stdlib.h> > #include <unistd.h> > #include <sys/types.h> > #include <sys/wait.h> > > static char filename[] = "/tmp/tmpfXXXXXX"; > static int fd = 0; > > int main(void) { > if ((fd = mkstemp(filename)) >= 0) { > pid_t pid; > if ((pid = fork()) > 0) { > /* parent */ > wait(NULL); > printf("unlinking '%s'\n", filename); > unlink(filename); > return EXIT_SUCCESS; > } else { > /* child */ > printf("file name is '%s'\n", filename); > sleep(10); > abort(); > } > } > return EXIT_FAILURE; > } This approach has usual problems of making a mess if the program want to fork() for other reasons, since the child should continue to execute a logic in your case, but cannot wait for already forked processes.
Usual advice is to have child monitoring the liveness of the parent. You can either create a pipe before fork and read(2) from it in child, never writing from parent. read(2) will return when parent exits. Or, periodically compare getppid() with 1 in child, and do the cleanup when equal. Usually, it is too much hassle to do any of the tricks, normal system cleanup of /tmp on reboot is good enough.
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