From 8002952a4e49ed0a38779727783e1eb273e536ff Mon Sep 17 00:00:00 2001
From: lns <matzeton@googlemail.com>
Date: Sun, 29 Apr 2018 18:48:51 +0200
Subject: POTD sekeleton #38.

Signed-off-by: lns <matzeton@googlemail.com>
---
 src/utils.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'src/utils.c')

diff --git a/src/utils.c b/src/utils.c
index b4820d0..aa62beb 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -8,10 +8,13 @@
 #include <pwd.h>
 #include <grp.h>
 #include <sys/types.h>
+#undef makedev
+#include <sys/sysmacros.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/prctl.h>
 #include <sys/mount.h>
+#include <linux/limits.h>
 #include <assert.h>
 
 #include "utils.h"
@@ -305,7 +308,42 @@ int mount_pts(const char *mount_path)
     return 0;
 }
 
+int create_device_file_checked(const char *mount_path, const char *device_file,
+                               mode_t mode, int add_mode, dev_t dev)
+{
+    int s;
+    mode_t defmode = S_IRUSR|S_IWUSR|
+                     S_IRGRP|S_IWGRP|
+                     S_IROTH;
+    size_t plen = strnlen(mount_path, PATH_MAX);
+    size_t dlen = strnlen(device_file, PATH_MAX);
+    struct stat devbuf = {0};
+    char devpath[plen+dlen+1];
+
+    snprintf(devpath, plen+dlen+1, "%s/%s", mount_path, device_file);
+    s = stat(devpath, &devbuf);
+
+    if (s && errno != EEXIST) {
+        return 1;
+    } else if (s && errno == EEXIST) {
+    }
+
+    D2("Create device file: %s", devpath);
+    if (!add_mode)
+        defmode = 0;
+    s = mknod(devpath, defmode|mode, dev);
+    if (s) {
+        E2("Device file creation '%s' failed", devpath);
+        E_STRERR("Device creation");
+        return 1;
+    }
+
+    return 0;
+}
+
 int create_device_files(const char *mount_path)
 {
+    create_device_file_checked(mount_path, "ptmx", 0, 1, makedev(5,2));
+
     return 0;
 }
-- 
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