Rename open_fd to device_fd

[keystroke-timestamps] / keystroke-timestamps.c

diff --git a/keystroke-timestamps.c b/keystroke-timestamps.c
index 670b43c73c9b7aa2eee530861105dc41311d9a46..d7aeaf660ff4f8450310435aeb1e8a47ed0178d5 100644 (file)
--- a/keystroke-timestamps.c
+++ b/keystroke-timestamps.c
@@ -1,16 +1,80 @@
+#include <err.h>
 #include <fcntl.h>
+#include <glob.h>
+#include <getopt.h>
+#include <linux/input.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <sys/select.h>
 #include <unistd.h>
-#include <linux/input.h>
 
-int main ()
+int main (int argc, char **argv)
 {
+  int print_usec = 0;
+  char* device = "/dev/input/by-path/*kbd*";
+  struct option long_options[] = {
+    {"device", required_argument, 0,            'd' },
+    {"usec",   no_argument,       &print_usec,  1   },
+    {0,        0,                 0,            0   },
+  };
+  while (1) {
+    int c = getopt_long(argc, argv, "", long_options, NULL);
+    if (c == -1) break;
+    if (c == 'd') {
+      device = optarg;
+      continue;
+    }
+    if (c != 0) exit(EX_USAGE);
+  }
+
+  fd_set all_inputs;
+  FD_ZERO(&all_inputs);
+  int maxfd = 0;
+  glob_t glob_result;
+  int glob_return = glob(device, GLOB_ERR | GLOB_NOSORT, NULL, &glob_result);
+  if (glob_return == GLOB_NOMATCH) {
+    errx(EX_NOINPUT, "Could not find keyboard event file(s): %s", device);
+  }
+  if (glob_return != 0) {
+    err(EX_NOINPUT, "Could not glob keyboard event file(s): %s", device);
+  }
+  for (unsigned i = 0; i < glob_result.gl_pathc; i++) {
+    int device_fd = open(glob_result.gl_pathv[i], O_RDONLY);
+    if (device_fd < 0) {
+      err(EX_NOINPUT, "Could not open keyboard event file: %s", glob_result.gl_pathv[i]);
+    }
+    if (device_fd > maxfd) {
+      maxfd = device_fd;
+    }
+    FD_SET(device_fd, &all_inputs);
+  }
+  globfree(&glob_result);
+
   struct input_event i;
-  int fd = open("/dev/input/by-path/platform-i8042-serio-0-event-kbd", O_RDONLY);
-  while (fd && read(fd, &i, sizeof(i)) == sizeof(i)) {
-    if (i.type == 1 && i.value == 1) {
-      printf("%ld.%ld\n", i.time.tv_sec, i.time.tv_usec);
-      fflush(stdout);
+  while (1) {
+    fd_set ready_inputs = all_inputs;
+    if (select(maxfd+1, &ready_inputs, NULL, NULL, NULL) != 1) {
+      err(EX_IOERR, "select");
+    }
+    for (int fd=0; fd <= maxfd; fd++) {
+      if (FD_ISSET(fd, &ready_inputs)) {
+        int read_return = read(fd, &i, sizeof(i));
+        if (read_return == -1) {
+          err(EX_IOERR, "read");
+        }
+        if (read_return != sizeof(i)) {
+          errx(EX_IOERR, "Unexpected EOF");
+        }
+        if (i.type == 1 && i.value == 1) {
+          if (print_usec) {
+            printf("%ld.%06ld\n", i.time.tv_sec, i.time.tv_usec);
+          } else {
+            printf("%ld\n", i.time.tv_sec);
+          }
+          fflush(stdout);
+        }
+      }
     }
   }
   return 0;