Move list_ports() implementations to OS-specific files.

[libserialport.git] / linux.c

diff --git a/linux.c b/linux.c
index 23258514534d21e4a9f4e631373b324340aba10b..730ba9d0433caa2d2b79f089ce236fc8fd2e856a 100644 (file)
--- a/linux.c
+++ b/linux.c
@@ -155,3 +155,58 @@ enum sp_return get_port_details(struct sp_port *port)
 
        RETURN_OK();
 }
+
+enum sp_return list_ports(struct sp_port ***list)
+{
+       char name[PATH_MAX], target[PATH_MAX];
+       struct dirent entry, *result;
+       struct serial_struct serial_info;
+       int len, fd, ioctl_result;
+       DIR *dir;
+       int ret = SP_OK;
+
+       DEBUG("Enumerating tty devices");
+       if (!(dir = opendir("/sys/class/tty")))
+               RETURN_FAIL("could not open /sys/class/tty");
+
+       DEBUG("Iterating over results");
+       while (!readdir_r(dir, &entry, &result) && result) {
+               len = readlinkat(dirfd(dir), entry.d_name, target, sizeof(target));
+               if (len <= 0 || len >= (int) sizeof(target)-1)
+                       continue;
+               target[len] = 0;
+               if (strstr(target, "virtual"))
+                       continue;
+               snprintf(name, sizeof(name), "/dev/%s", entry.d_name);
+               DEBUG("Found device %s", name);
+               if (strstr(target, "serial8250")) {
+                       /* The serial8250 driver has a hardcoded number of ports.
+                        * The only way to tell which actually exist on a given system
+                        * is to try to open them and make an ioctl call. */
+                       DEBUG("serial8250 device, attempting to open");
+                       if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
+                               DEBUG("open failed, skipping");
+                               continue;
+                       }
+                       ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
+                       close(fd);
+                       if (ioctl_result != 0) {
+                               DEBUG("ioctl failed, skipping");
+                               continue;
+                       }
+                       if (serial_info.type == PORT_UNKNOWN) {
+                               DEBUG("port type is unknown, skipping");
+                               continue;
+                       }
+               }
+               DEBUG("Found port %s", name);
+               *list = list_append(*list, name);
+               if (!list) {
+                       SET_ERROR(ret, SP_ERR_MEM, "list append failed");
+                       break;
+               }
+       }
+       closedir(dir);
+
+       return ret;
+}