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fanotify.7: Minor tweaks to example program 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-04-25 10:00:53 +02:00
parent ddb112c281
commit f776794974
1 changed files with 31 additions and 33 deletions
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64
man7/fanotify.7
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@ -473,7 +473,7 @@ Listening for events stopped.
.in
.SS Program source
.nf
#define _GNU_SOURCE // needed for O_LARGEFILE
#define _GNU_SOURCE /* Needed to get O_LARGEFILE defintion */
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
@ -496,11 +496,11 @@ handle_events(int fd)
char procfd_path[PATH_MAX];
struct fanotify_response response;
/* Loop while events can be read from fanotify file descriptor. */
/* Loop while events can be read from fanotify file descriptor */
for(;;) {
/* Read some events. */
/* Read some events */
len = read(fd, (void *) &buf, sizeof(buf));
if (len == \-1 && errno != EAGAIN) {
@ -508,21 +508,20 @@ handle_events(int fd)
exit(EXIT_FAILURE);
}
/* Check if end of available data reached. */
/* Check if end of available data reached */
if (len <= 0)
break;
/* Point to the first event in the buffer. */
/* Point to the first event in the buffer */
metadata = (struct fanotify_event_metadata *) buf;
/* Loop over all events in the buffer. */
/* Loop over all events in the buffer */
while (FAN_EVENT_OK(metadata, len)) {
/* Check that run time and compile time structures
match. */
/* Check that run\-time and compile\-time structures match */
if (metadata\->vers != FANOTIFY_METADATA_VERSION) {
fprintf(stderr,
@ -530,30 +529,29 @@ handle_events(int fd)
exit(EXIT_FAILURE);
}
/* Check that the event contains a file descriptor. */
/* Check that the event contains a file descriptor */
if (metadata\->fd >= 0) {
/* Handle open permission event. */
/* Handle open permission event */
if (metadata\->mask & FAN_OPEN_PERM) {
printf("FAN_OPEN_PERM: ");
/* Allow file to be opened. */
/* Allow file to be opened */
response.fd = metadata\->fd;
response.response = FAN_ALLOW;
write(fd, &response, sizeof(
struct fanotify_response));
write(fd, &response,
sizeof(struct fanotify_response));
}
/* Handle closing of writable file event. */
/* Handle closing of writable file event */
if (metadata\->mask & FAN_CLOSE_WRITE) {
if (metadata\->mask & FAN_CLOSE_WRITE)
printf("FAN_CLOSE_WRITE: ");
}
/* Determine path of the file accessed. */
/* Determine path of the file accessed */
snprintf(procfd_path, sizeof(procfd_path),
"/proc/self/fd/%d", metadata\->fd);
@ -567,13 +565,13 @@ handle_events(int fd)
path[path_len] = '\\0';
printf("File %s", path);
/* Close the file descriptor of the event. */
/* Close the file descriptor of the event */
close(metadata\->fd);
printf("\\n");
}
/* Forward pointer to next event. */
/* Forward pointer to next event */
metadata = FAN_EVENT_NEXT(metadata, len);
}
@ -588,16 +586,16 @@ main(int argc, char *argv[])
nfds_t nfds;
struct pollfd fds[2];
/* Check mount point is supplied. */
/* Check mount point is supplied */
if (argc != 2) {
printf("Usage: %s MOUNT\\n", argv[0]);
fprintf(stderr, "Usage: %s MOUNT\\n", argv[0]);
exit(EXIT_FAILURE);
}
printf("Press enter key to terminate.\\n");
/* Create the file descriptor for accessing the fanotify API. */
/* Create the file descriptor for accessing the fanotify API */
fd = fanotify_init(FAN_CLOEXEC | FAN_CLASS_CONTENT | FAN_NONBLOCK,
O_RDONLY | O_LARGEFILE);
@ -606,10 +604,10 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
/* Mark the mount for
/* Mark the mount for:
\- permission events before opening files
\- notification events after closing a write enabled
file descriptor. */
\- notification events after closing a write\-enabled
file descriptor */
if (fanotify_mark(fd, FAN_MARK_ADD | FAN_MARK_MOUNT,
FAN_OPEN_PERM | FAN_CLOSE_WRITE, \-1,
@ -619,21 +617,21 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
/* Prepare for polling. */
/* Prepare for polling */
nfds = 2;
/* Console input. */
/* Console input */
fds[0].fd = STDIN_FILENO;
fds[0].events = POLLIN;
/* Fanotify input. */
/* Fanotify input */
fds[1].fd = fd;
fds[1].events = POLLIN;
/* This is the loop to wait for incoming events. */
/* This is the loop to wait for incoming events */
printf("Listening for events.\\n");
while (1) {
@ -647,7 +645,7 @@ main(int argc, char *argv[])
if (poll_num > 0) {
if (fds[0].revents & POLLIN) {
/* Console input is available. Empty stdin and quit. */
/* Console input is available: empty stdin and quit */
while (read(STDIN_FILENO, &buf, 1) > 0 && buf != '\\n')
continue;
@ -655,18 +653,18 @@ main(int argc, char *argv[])
}
if (fds[1].revents & POLLIN) {
/* Fanotify events are available. */
/* Fanotify events are available */
handle_events(fd);
}
}
}
/* Close fanotify file descriptor. */
/* Close fanotify file descriptor */
close(fd);
printf("Listening for events stopped.\\n");
return EXIT_SUCCESS;
exit(EXIT_SUCCESS);
}
.fi
.SH "SEE ALSO"