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Kernel: Introduce the DevFS

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The DevFS along with DevPtsFS give a complete solution for populating
device nodes in /dev. The main purpose of DevFS is to eliminate the
need of device nodes generation when building the system.

Later on, DevFS will assist with exposing disk partition nodes.
This commit is contained in:
Liav A 2020-12-25 19:26:38 +02:00 • committed by Andreas Kling
parent 18e77aa285
commit 247517cd4a
7 changed files with 774 additions and 55 deletions
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81
Services/SystemServer/main.cpp
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@ -34,6 +34,7 @@
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
@ -84,6 +85,84 @@ static void parse_boot_mode()
dbg() << "Booting in " << g_boot_mode << " mode";
}
static void prepare_devfs()
{
// FIXME: Find a better way to all of this stuff, without hardcoding all of this!
int rc = mount(-1, "/dev", "dev", 0);
if (rc != 0) {
ASSERT_NOT_REACHED();
}
rc = mkdir("/dev/pts", 0755);
if (rc != 0) {
ASSERT_NOT_REACHED();
}
rc = mount(-1, "/dev/pts", "devpts", 0);
if (rc != 0) {
ASSERT_NOT_REACHED();
}
rc = symlink("/dev/random", "/dev/urandom");
if (rc < 0) {
ASSERT_NOT_REACHED();
}
// FIXME: Find a better way to chown without hardcoding the gid!
rc = chown("/dev/fb0", 0, 3);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
// FIXME: Find a better way to chown without hardcoding the gid!
rc = chown("/dev/keyboard", 0, 3);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
// FIXME: Find a better way to chown without hardcoding the gid!
rc = chown("/dev/mouse", 0, 3);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
for (size_t index = 0; index < 4; index++) {
// FIXME: Find a better way to chown without hardcoding the gid!
rc = chown(String::format("/dev/tty%d", index).characters(), 0, 2);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
}
for (size_t index = 0; index < 4; index++) {
// FIXME: Find a better way to chown without hardcoding the gid!
rc = chown(String::format("/dev/ttyS%d", index).characters(), 0, 2);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
}
// FIXME: Find a better way to chown without hardcoding the gid!
rc = chown("/dev/audio", 0, 4);
if (rc < 0) {
ASSERT_NOT_REACHED();
}
rc = symlink("/proc/self/fd/0", "/dev/stdin");
if (rc < 0) {
ASSERT_NOT_REACHED();
}
rc = symlink("/proc/self/fd/1", "/dev/stdout");
if (rc < 0) {
ASSERT_NOT_REACHED();
}
rc = symlink("/proc/self/fd/2", "/dev/stderr");
if (rc < 0) {
ASSERT_NOT_REACHED();
}
}
static void mount_all_filesystems()
{
dbg() << "Spawning mount -a to mount all filesystems.";
@ -103,6 +182,8 @@ static void mount_all_filesystems()
int main(int, char**)
{
prepare_devfs();
if (pledge("stdio proc exec tty accept unix rpath wpath cpath chown fattr id sigaction", nullptr) < 0) {
perror("pledge");
return 1;