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Correzioni estetiche al codice con maggiori controlli sugli errori.
author
Simone Piccardi
<piccardi@gnulinux.it>
Sun, 29 Jul 2007 15:41:51 +0000
(15:41 +0000)
committer
Simone Piccardi
<piccardi@gnulinux.it>
Sun, 29 Jul 2007 15:41:51 +0000
(15:41 +0000)
sources/inotify_monitor.c
patch
|
blob
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diff --git
a/sources/inotify_monitor.c
b/sources/inotify_monitor.c
index 1acfdb0c65d58b0fa99961ce42b286730958f50c..e5e04d9aaf369543a59de9093971197fccb5b563 100644
(file)
--- a/
sources/inotify_monitor.c
+++ b/
sources/inotify_monitor.c
@@
-18,10
+18,10
@@
*/
/*****************************************************************************
*
*/
/*****************************************************************************
*
- * File inot
u
fy_monitor.c:
+ * File inot
i
fy_monitor.c:
*
*
- * An example
for shared memory use: monitor a directory status,
- * s
aving data in a shared memory segment
+ * An example
of the inotify interface: use inotify to watch the
+ * s
tatus of a directory or a file
*
* Author: S. Piccardi Jul. 2007
*
*
* Author: S. Piccardi Jul. 2007
*
@@
-36,7
+36,7
@@
#include <stdio.h> /* standard I/O library */
#include <string.h> /* string functions */
#include <fcntl.h> /* fcntl function */
#include <stdio.h> /* standard I/O library */
#include <string.h> /* string functions */
#include <fcntl.h> /* fcntl function */
-#include <sys/ioctl.h>
/* fcn
tl function */
+#include <sys/ioctl.h>
/* ioc
tl function */
#include "macros.h"
#include "macros.h"
@@
-58,7
+58,7
@@
int main(int argc, char *argv[])
* Use getopt function
*/
opterr = 0; /* don't want writing to stderr */
* Use getopt function
*/
opterr = 0; /* don't want writing to stderr */
- while (
(i = getopt(argc, argv, "hrwcda")) != -1) {
+ while ((i = getopt(argc, argv, "hrwcda")) != -1) {
switch (i) {
/*
* Handling options
switch (i) {
/*
* Handling options
@@
-95,54
+95,55
@@
int main(int argc, char *argv[])
* Main code beginning
*
* ***********************************************************/
* Main code beginning
*
* ***********************************************************/
- /* There must be one argument */
- if ((argc - optind) != 1) {
+ if ((argc - optind) != 1) { /* There must be one argument */
printf("Wrong number of arguments %d\n", argc - optind);
usage();
}
printf("Wrong number of arguments %d\n", argc - optind);
usage();
}
- /* initializa epoll */
- epfd = epoll_create(5);
- if (epfd < 0)
+ epfd = epoll_create(5); /* initialize epoll */
+ if (epfd < 0) {
perror("Failing on epoll_create");
perror("Failing on epoll_create");
-
- /* initalialize inotify */
- fd = inotify_init();
- if (fd < 0)
+ exit(-1);
+ }
+ fd = inotify_init();
/* initialize inotify */
+ if (fd < 0)
{
perror("Failing on inotify_init");
perror("Failing on inotify_init");
- if (fcntl(fd, F_SETFL, O_NONBLOCK))
+ exit(-1);
+ }
+ if (fcntl(fd, F_SETFL, O_NONBLOCK)) { /* no blocking I/O on inotify */
perror("Cannot set noblocking I/O on inotify fd");
perror("Cannot set noblocking I/O on inotify fd");
-
- /* add watch */
- wd = inotify_add_watch(fd, argv[optind], mask);
- if (
wd <= 0) {
+ exit(-1);
+ }
+ wd = inotify_add_watch(fd, argv[optind], mask);
/* add watch */
+ if (wd <= 0) {
printf("Failing to add watched file %s, mask %i; %s\n",
argv[optind], mask, strerror(errno));
exit(-1);
}
printf("Failing to add watched file %s, mask %i; %s\n",
argv[optind], mask, strerror(errno));
exit(-1);
}
-
- /* add inotify fd to epoll */
- epev.data.fd = fd;
+ epev.data.fd = fd; /* add inotify fd to epoll */
epev.events = EPOLLIN;
epev.events = EPOLLIN;
- if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &epev))
+ if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &epev))
{
perror("Failing on epoll_ctl");
perror("Failing on epoll_ctl");
-
+ exit(-1);
+ }
/*
* Main Loop: read events and print them
*/
while (1) {
/*
* Main Loop: read events and print them
*/
while (1) {
- if (epoll_wait(epfd, &epev, 1, -1) < 0
)
+ if (epoll_wait(epfd, &epev, 1, -1) < 0
) {
perror("error on epoll_wait");
perror("error on epoll_wait");
-
+ exit(-1);
+ }
if (epev.data.fd != fd)
printf("something wrong, epoll activity on %i instead of %i\n",
epev.data.fd, fd);
if (epev.data.fd != fd)
printf("something wrong, epoll activity on %i instead of %i\n",
epev.data.fd, fd);
- if (ioctl(fd, FIONREAD, &size))
+ if (ioctl(fd, FIONREAD, &size))
{
perror("error on getting inotify event size");
perror("error on getting inotify event size");
-
+ exit(-1);
+ }
if (size > sizeof(buffer)) {
printf("Too many %i data to read, something wrong\n", size);
if (size > sizeof(buffer)) {
printf("Too many %i data to read, something wrong\n", size);
- exit(1);
+ exit(
-
1);
}
i = 0;
while (i < size) {
}
i = 0;
while (i < size) {
@@
-152,21
+153,19
@@
int main(int argc, char *argv[])
exit(1);
}
i += nread;
exit(1);
}
i += nread;
-
event = (struct inotify_event *) buffer;
if (wd != event->wd) {
printf("Getting different watch descriptor, %i and %i\n",
wd, event->wd);
event = (struct inotify_event *) buffer;
if (wd != event->wd) {
printf("Getting different watch descriptor, %i and %i\n",
wd, event->wd);
- exit(1);
+ } else {
+ printf("Observed event on %s\n", argv[optind-1+event->wd]);
+ if (event->name != NULL)
+ printf("On file %s\n", event->name);
+ printevent(event->mask);
}
}
- printf("Observed event on %s\n", argv[optind-1+event->wd]);
- if (event->name != NULL)
- printf("On file %s\n", event->name);
- printevent(event->mask);
}
}
return 0;
}
}
return 0;
-
}
/*
* routine to print usage info and exit
}
/*
* routine to print usage info and exit