Add bin/true and bin/false implementations

- Added assembly implementations for `true` and `false` commands.
- Updated Kbuild files to include new binaries.
- Removed unused libraries and headers.
- Cleaned up makefile and unused code.

9 files changed, 92 insertions, 6 deletions

diff --git a/lib/libc/unistd/Kbuild b/lib/libc/unistd/Kbuild
new file mode 100644
index 00000000..ff3f025a
--- /dev/null
+++ b/lib/libc/unistd/Kbuild
@@ -0,0 +1,77 @@
+obj-y += _exit.o
+obj-y += _Fork.o
+obj-y += access.o
+obj-y += alarm.o
+obj-y += chdir.o
+obj-y += chown.o
+obj-y += close.o
+obj-y += dup.o
+obj-y += dup2.o
+obj-y += dup3.o
+obj-y += execl.o
+obj-y += execlp.o
+obj-y += execv.o
+obj-y += execve.o
+obj-y += execvp.o
+obj-y += faccessat.o
+obj-y += fchdir.o
+obj-y += fchown.o
+obj-y += fchownat.o
+obj-y += fdatasync.o
+obj-y += fork.o
+obj-y += fsync.o
+obj-y += ftruncate.o
+obj-y += getcwd.o
+obj-y += getegid.o
+obj-y += getentropy.o
+obj-y += geteuid.o
+obj-y += getgid.o
+obj-y += getgroups.o
+obj-y += gethostid.o
+obj-y += gethostname.o
+obj-y += getlogin_r.o
+obj-y += getlogin.o
+obj-y += getopt.o
+obj-y += getpgid.o
+obj-y += getpid.o
+obj-y += getppid.o
+obj-y += getresgid.o
+obj-y += getresuid.o
+obj-y += getsid.o
+obj-y += getuid.o
+obj-y += isatty.o
+obj-y += lchown.o
+obj-y += link.o
+obj-y += linkat.o
+obj-y += lockf.o
+obj-y += lseek.o
+obj-y += nice.o
+obj-y += pause.o
+obj-y += pipe.o
+obj-y += pipe2.o
+obj-y += posix_close.o
+obj-y += pread.o
+obj-y += pwrite.o
+obj-y += read.o
+obj-y += readlink.o
+obj-y += readlinkat.o
+obj-y += rmdir.o
+obj-y += setegid.o
+obj-y += seteuid.o
+obj-y += setgid.o
+obj-y += setpgid.o
+obj-y += setregid.o
+obj-y += setresgid.o
+obj-y += setresuid.o
+obj-y += setreuid.o
+obj-y += setsid.o
+obj-y += setuid.o
+obj-y += sleep.o
+obj-y += swab.o
+obj-y += symlink.o
+obj-y += symlinkat.o
+obj-y += sync.o
+obj-y += truncate.o
+obj-y += unlink.o
+obj-y += unlinkat.o
+obj-y += write.o
diff --git a/lib/libc/unistd/execlp.c b/lib/libc/unistd/execlp.c
index 4613a7ee..db044d50 100644
--- a/lib/libc/unistd/execlp.c
+++ b/lib/libc/unistd/execlp.c
@@ -1,8 +1,6 @@
 #include <stdarg.h>
-#include <stddef.h>
-#include <syscall.h>
+#include <unistd.h>
 
-// TODO: need to find in path and call execl
 int execlp(const char *path, const char *argv0, ...)
 {
 	int argc;
@@ -23,5 +21,5 @@ int execlp(const char *path, const char *argv0, ...)
 	argv[argc] = NULL;
 	va_end(ap);
 
-	return syscall(execve, path, argv, 0);
+	return execve(path, argv, 0);
 }
diff --git a/lib/libc/unistd/execvp.c b/lib/libc/unistd/execvp.c
index 2ce69354..ae8ecdb9 100644
--- a/lib/libc/unistd/execvp.c
+++ b/lib/libc/unistd/execvp.c
@@ -3,6 +3,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 extern char **environ;
 
@@ -17,7 +18,7 @@ int execvp(const char *file, char *const argv[])
 		return execv(file, argv);
 	} else {
 		char *ptr;
-		char *path = NULL; // TODO: getenv
+		char *path = getenv("PATH");
 
 		if (path == NULL || *path == '\0') {
 			path = "/bin";
diff --git a/lib/libc/unistd/getentropy.c b/lib/libc/unistd/getentropy.c
index f55fed7a..3a651ba5 100644
--- a/lib/libc/unistd/getentropy.c
+++ b/lib/libc/unistd/getentropy.c
@@ -3,6 +3,8 @@
 
 int getentropy(void *buffer, size_t length)
 {
+	(void)buffer;
+	(void)length;
 	// TODO
 	return 0;
 }
diff --git a/lib/libc/unistd/gethostname.c b/lib/libc/unistd/gethostname.c
index a20808e1..5bd303f5 100644
--- a/lib/libc/unistd/gethostname.c
+++ b/lib/libc/unistd/gethostname.c
@@ -3,6 +3,8 @@
 
 int gethostname(char *name, size_t namelen)
 {
+	(void)name;
+	(void)namelen;
 	// TODO
 	return 0;
 }
diff --git a/lib/libc/unistd/getlogin_r.c b/lib/libc/unistd/getlogin_r.c
index 3dea2dff..70ae5ddd 100644
--- a/lib/libc/unistd/getlogin_r.c
+++ b/lib/libc/unistd/getlogin_r.c
@@ -3,6 +3,8 @@
 
 int getlogin_r(char *name, size_t namesize)
 {
+	(void)name;
+	(void)namesize;
 	// TODO
 	return 0;
 }
diff --git a/lib/libc/unistd/lockf.c b/lib/libc/unistd/lockf.c
index 8b807c34..6f109c55 100644
--- a/lib/libc/unistd/lockf.c
+++ b/lib/libc/unistd/lockf.c
@@ -3,6 +3,9 @@
 
 int lockf(int fildes, int function, off_t size)
 {
+	(void)fildes;
+	(void)function;
+	(void)size;
 	// TODO
 	return 0;
 }
diff --git a/lib/libc/unistd/nice.c b/lib/libc/unistd/nice.c
index 3b240c93..6da984df 100644
--- a/lib/libc/unistd/nice.c
+++ b/lib/libc/unistd/nice.c
@@ -3,6 +3,7 @@
 
 int nice(int incr)
 {
+	(void)incr;
 	// TODO: needs getpriority and setpriority from sys/resouce.h
 	return 0;
 }
diff --git a/lib/libc/unistd/posix_close.c b/lib/libc/unistd/posix_close.c
index fe44a7b9..78ec692e 100644
--- a/lib/libc/unistd/posix_close.c
+++ b/lib/libc/unistd/posix_close.c
@@ -1,7 +1,7 @@
 #include <libc.h>
 #include <syscall.h>
 
-int posix_close(int fildes, int unused flag)
+int posix_close(int fildes, int __unused flag)
 {
 	return syscall(close, fildes);
 }