Documentation/fs/: split txt and source files
Make dnotify_test.c source file and add it to Makefile so that bitrot can be prevented. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1,3 +1,3 @@
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obj-m := DocBook/ accounting/ auxdisplay/ connector/ \
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filesystems/configfs/ ia64/ laptops/ networking/ \
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filesystems/ filesystems/configfs/ ia64/ laptops/ networking/ \
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pcmcia/ spi/ timers/ video4linux/ vm/ watchdog/src/
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@ -32,6 +32,8 @@ dlmfs.txt
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- info on the userspace interface to the OCFS2 DLM.
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dnotify.txt
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- info about directory notification in Linux.
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dnotify_test.c
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- example program for dnotify
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ecryptfs.txt
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- docs on eCryptfs: stacked cryptographic filesystem for Linux.
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exofs.txt
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@ -0,0 +1,8 @@
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# kbuild trick to avoid linker error. Can be omitted if a module is built.
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obj- := dummy.o
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# List of programs to build
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hostprogs-y := dnotify_test
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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@ -62,38 +62,9 @@ disabled, fcntl(fd, F_NOTIFY, ...) will return -EINVAL.
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Example
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-------
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See Documentation/filesystems/dnotify_test.c for an example.
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#define _GNU_SOURCE /* needed to get the defines */
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#include <fcntl.h> /* in glibc 2.2 this has the needed
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values defined */
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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static volatile int event_fd;
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static void handler(int sig, siginfo_t *si, void *data)
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{
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event_fd = si->si_fd;
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}
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int main(void)
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{
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struct sigaction act;
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int fd;
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act.sa_sigaction = handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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sigaction(SIGRTMIN + 1, &act, NULL);
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fd = open(".", O_RDONLY);
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fcntl(fd, F_SETSIG, SIGRTMIN + 1);
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fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);
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/* we will now be notified if any of the files
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in "." is modified or new files are created */
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while (1) {
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pause();
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printf("Got event on fd=%d\n", event_fd);
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}
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}
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NOTE
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----
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Beginning with Linux 2.6.13, dnotify has been replaced by inotify.
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See Documentation/filesystems/inotify.txt for more information on it.
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@ -0,0 +1,34 @@
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#define _GNU_SOURCE /* needed to get the defines */
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#include <fcntl.h> /* in glibc 2.2 this has the needed
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values defined */
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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static volatile int event_fd;
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static void handler(int sig, siginfo_t *si, void *data)
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{
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event_fd = si->si_fd;
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}
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int main(void)
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{
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struct sigaction act;
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int fd;
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act.sa_sigaction = handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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sigaction(SIGRTMIN + 1, &act, NULL);
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fd = open(".", O_RDONLY);
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fcntl(fd, F_SETSIG, SIGRTMIN + 1);
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fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);
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/* we will now be notified if any of the files
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in "." is modified or new files are created */
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while (1) {
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pause();
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printf("Got event on fd=%d\n", event_fd);
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}
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}
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