+++ /dev/null
-/* $Id: mlockfile.c 6014 2002-12-16 11:28:07Z alexk $ */
-
-/* Locks the files given on the command line into memory using mlock.
- This code has only been tested on Solaris and may not work on other
- platforms.
-
- Contributed by Alex Kiernan <alexk@demon.net>. */
-
-#include <sys/types.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sysexits.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/stropts.h>
-
-struct mlock {
- const char *path;
- struct stat st;
- void *base;
- off_t offset;
- size_t length;
-};
-
-char *progname;
-
-int flush = 0;
-int interval = 60000;
-
-void
-inn_lock_files(struct mlock *ml)
-{
- for (; ml->path != NULL; ++ml) {
- int fd;
-
- fd = open(ml->path, O_RDONLY);
- if (fd == -1) {
- fprintf(stderr, "%s: can't open `%s' - %s\n",
- progname, ml->path, strerror(errno));
- } else {
- struct stat st;
-
- /* check if size, inode or device of the path have
- * changed, if so unlock the previous file & lock the new
- * one */
- if (fstat(fd, &st) != 0) {
- fprintf(stderr, "%s: can't stat `%s' - %s\n",
- progname, ml->path, strerror(errno));
- } else if (ml->st.st_ino != st.st_ino ||
- ml->st.st_dev != st.st_dev ||
- ml->st.st_size != st.st_size) {
- if (ml->base != MAP_FAILED)
- munmap(ml->base,
- ml->length ? ml->length : ml->st.st_size);
-
- /* free everything here, so in case of failure we try
- * again next time */
- ml->st.st_ino = 0;
- ml->st.st_dev = 0;
- ml->st.st_size = 0;
-
- ml->base = mmap(NULL,
- ml->length ? ml->length : st.st_size,
- PROT_READ,
- MAP_SHARED, fd, ml->offset);
-
- if (ml->base == MAP_FAILED) {
- fprintf(stderr, "%s: can't mmap `%s' - %s\n",
- progname, ml->path, strerror(errno));
- } else {
- if (mlock(ml->base,
- ml->length ? ml->length : st.st_size) != 0) {
- fprintf(stderr, "%s: can't mlock `%s' - %s\n",
- progname, ml->path, strerror(errno));
- } else {
- ml->st = st;
- }
- }
- } else if (flush) {
- msync(ml->base, ml->length ? ml->length : st.st_size, MS_SYNC);
- }
- }
- close (fd);
- }
-}
-
-static void
-usage(void)
-{
- fprintf(stderr,
- "usage: %s [-f] [-i interval] file[@offset[:length]] ...\n",
- progname);
- fprintf(stderr, " -f\tflush locked bitmaps at interval\n");
- fprintf(stderr, " -i interval\n\tset interval between checks/flushes\n");
-}
-
-int
-main(int argc, char *argv[])
-{
- struct mlock *ml;
- int i;
-
- progname = *argv;
- while ((i = getopt(argc, argv, "fi:")) != EOF) {
- switch (i) {
- case 'i':
- interval = 1000 * atoi(optarg);
- break;
-
- case 'f':
- flush = 1;
- break;
-
- default:
- usage();
- return EX_USAGE;
- }
- }
- argc -= optind;
- argv += optind;
-
- /* construct list of pathnames which we're to operate on, zero out
- * the "cookies" so we lock it in core first time through */
- ml = malloc((1 + argc) * sizeof ml);
- for (i = 0; argc--; ++i, ++argv) {
- char *at;
- off_t offset = 0;
- size_t length = 0;
-
- ml[i].path = *argv;
- ml[i].st.st_ino = 0;
- ml[i].st.st_dev = 0;
- ml[i].st.st_size = 0;
- ml[i].base = MAP_FAILED;
-
- /* if we have a filename of the form ...@offset:length, only
- * map in that portion of the file */
- at = strchr(*argv, '@');
- if (at != NULL) {
- char *end;
-
- *at++ = '\0';
- errno = 0;
- offset = strtoull(at, &end, 0);
- if (errno != 0) {
- fprintf(stderr, "%s: can't parse offset `%s' - %s\n",
- progname, at, strerror(errno));
- return EX_USAGE;
- }
- if (*end == ':') {
- at = end + 1;
- errno = 0;
- length = strtoul(at, &end, 0);
- if (errno != 0) {
- fprintf(stderr, "%s: can't parse length `%s' - %s\n",
- progname, at, strerror(errno));
- return EX_USAGE;
- }
- }
- if (*end != '\0') {
- fprintf(stderr, "%s: unrecognised separator `%c'\n",
- progname, *end);
- return EX_USAGE;
- }
- }
- ml[i].offset = offset;
- ml[i].length = length;
- }
- ml[i].path = NULL;
-
- /* loop over the list of paths, sleeping 60s between iterations */
- for (;;) {
- inn_lock_files(ml);
- poll(NULL, 0, interval);
- }
- return EX_OSERR;
-}
~ian / innduct.git / blobdiff