Move to C++ for debuggerd.

This is part 1, only including the bare minimum changes because
our diff tool doesn't easily show differences when a file moves. This
also breaks it into a small chunk in case some other changes break things,
as unlikely as I think that will be.

Change-Id: Ib7a3e7a2cc1ac574d15b65fda23813ebcf5d31af

1 files changed, 219 insertions, 0 deletions

diff --git a/debuggerd/getevent.cpp b/debuggerd/getevent.cpp
new file mode 100644
index 0000000..8d0b149
--- /dev/null
+++ b/debuggerd/getevent.cpp
@@ -0,0 +1,219 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/inotify.h>
+#include <sys/limits.h>
+#include <sys/poll.h>
+#include <linux/input.h>
+#include <errno.h>
+#include <cutils/log.h>
+
+static struct pollfd *ufds;
+static char **device_names;
+static int nfds;
+
+static int open_device(const char *device)
+{
+    int version;
+    int fd;
+    struct pollfd *new_ufds;
+    char **new_device_names;
+    char name[80];
+    char location[80];
+    char idstr[80];
+    struct input_id id;
+
+    fd = open(device, O_RDWR);
+    if(fd < 0) {
+        return -1;
+    }
+    
+    if(ioctl(fd, EVIOCGVERSION, &version)) {
+        return -1;
+    }
+    if(ioctl(fd, EVIOCGID, &id)) {
+        return -1;
+    }
+    name[sizeof(name) - 1] = '\0';
+    location[sizeof(location) - 1] = '\0';
+    idstr[sizeof(idstr) - 1] = '\0';
+    if(ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
+        //fprintf(stderr, "could not get device name for %s, %s\n", device, strerror(errno));
+        name[0] = '\0';
+    }
+    if(ioctl(fd, EVIOCGPHYS(sizeof(location) - 1), &location) < 1) {
+        //fprintf(stderr, "could not get location for %s, %s\n", device, strerror(errno));
+        location[0] = '\0';
+    }
+    if(ioctl(fd, EVIOCGUNIQ(sizeof(idstr) - 1), &idstr) < 1) {
+        //fprintf(stderr, "could not get idstring for %s, %s\n", device, strerror(errno));
+        idstr[0] = '\0';
+    }
+
+    new_ufds = reinterpret_cast<pollfd*>(realloc(ufds, sizeof(ufds[0]) * (nfds + 1)));
+    if(new_ufds == NULL) {
+        fprintf(stderr, "out of memory\n");
+        return -1;
+    }
+    ufds = new_ufds;
+    new_device_names = reinterpret_cast<char**>(realloc(device_names, sizeof(device_names[0]) * (nfds + 1)));
+    if(new_device_names == NULL) {
+        fprintf(stderr, "out of memory\n");
+        return -1;
+    }
+    device_names = new_device_names;
+    ufds[nfds].fd = fd;
+    ufds[nfds].events = POLLIN;
+    device_names[nfds] = strdup(device);
+    nfds++;
+
+    return 0;
+}
+
+int close_device(const char *device)
+{
+    int i;
+    for(i = 1; i < nfds; i++) {
+        if(strcmp(device_names[i], device) == 0) {
+            int count = nfds - i - 1;
+            free(device_names[i]);
+            memmove(device_names + i, device_names + i + 1, sizeof(device_names[0]) * count);
+            memmove(ufds + i, ufds + i + 1, sizeof(ufds[0]) * count);
+            nfds--;
+            return 0;
+        }
+    }
+    return -1;
+}
+
+static int read_notify(const char *dirname, int nfd)
+{
+    int res;
+    char devname[PATH_MAX];
+    char *filename;
+    char event_buf[512];
+    int event_size;
+    int event_pos = 0;
+    struct inotify_event *event;
+
+    res = read(nfd, event_buf, sizeof(event_buf));
+    if(res < (int)sizeof(*event)) {
+        if(errno == EINTR)
+            return 0;
+        fprintf(stderr, "could not get event, %s\n", strerror(errno));
+        return 1;
+    }
+    //printf("got %d bytes of event information\n", res);
+
+    strcpy(devname, dirname);
+    filename = devname + strlen(devname);
+    *filename++ = '/';
+
+    while(res >= (int)sizeof(*event)) {
+        event = (struct inotify_event *)(event_buf + event_pos);
+        //printf("%d: %08x \"%s\"\n", event->wd, event->mask, event->len ? event->name : "");
+        if(event->len) {
+            strcpy(filename, event->name);
+            if(event->mask & IN_CREATE) {
+                open_device(devname);
+            }
+            else {
+                close_device(devname);
+            }
+        }
+        event_size = sizeof(*event) + event->len;
+        res -= event_size;
+        event_pos += event_size;
+    }
+    return 0;
+}
+
+static int scan_dir(const char *dirname)
+{
+    char devname[PATH_MAX];
+    char *filename;
+    DIR *dir;
+    struct dirent *de;
+    dir = opendir(dirname);
+    if(dir == NULL)
+        return -1;
+    strcpy(devname, dirname);
+    filename = devname + strlen(devname);
+    *filename++ = '/';
+    while((de = readdir(dir))) {
+        if(de->d_name[0] == '.' &&
+           (de->d_name[1] == '\0' ||
+            (de->d_name[1] == '.' && de->d_name[2] == '\0')))
+            continue;
+        strcpy(filename, de->d_name);
+        open_device(devname);
+    }
+    closedir(dir);
+    return 0;
+}
+
+int init_getevent()
+{
+    int res;
+    const char *device_path = "/dev/input";
+
+    nfds = 1;
+    ufds = reinterpret_cast<pollfd*>(calloc(1, sizeof(ufds[0])));
+    ufds[0].fd = inotify_init();
+    ufds[0].events = POLLIN;
+
+	res = inotify_add_watch(ufds[0].fd, device_path, IN_DELETE | IN_CREATE);
+    if(res < 0) {
+        return 1;
+    }
+    res = scan_dir(device_path);
+    if(res < 0) {
+        return 1;
+    }
+    return 0;
+}
+
+void uninit_getevent()
+{
+    int i;
+    for(i = 0; i < nfds; i++) {
+        close(ufds[i].fd);
+    }
+    free(ufds);
+    ufds = 0;
+    nfds = 0;
+}
+
+int get_event(struct input_event* event, int timeout)
+{
+    int res;
+    int i;
+    int pollres;
+    const char *device_path = "/dev/input";
+    while(1) {
+        pollres = poll(ufds, nfds, timeout);
+        if (pollres == 0) {
+            return 1;
+        }
+        if(ufds[0].revents & POLLIN) {
+            read_notify(device_path, ufds[0].fd);
+        }
+        for(i = 1; i < nfds; i++) {
+            if(ufds[i].revents) {
+                if(ufds[i].revents & POLLIN) {
+                    res = read(ufds[i].fd, event, sizeof(*event));
+                    if(res < (int)sizeof(event)) {
+                        fprintf(stderr, "could not get event\n");
+                        return -1;
+                    }
+                    return 0;
+                }
+            }
+        }
+    }
+    return 0;
+}