syscalls: mkdirat and gethostname + uname stubs in mlibc

kernel-src/arch/x86-64/syscall.asm

@@ -26,6 +26,7 @@ extern syscall_isatty
 extern syscall_faccessat
 extern syscall_unlinkat
 extern syscall_ioctl
+extern syscall_mkdirat
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -54,7 +55,8 @@ dq syscall_isatty
 dq syscall_faccessat
 dq syscall_unlinkat
 dq syscall_ioctl
-syscallcount equ 27
+dq syscall_mkdirat
+syscallcount equ 28
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/arch/x86-64/syscalllog.c

@@ -4,7 +4,7 @@
 
 #ifdef SYSCALL_LOGGING
 
-#define SYSCALL_COUNT 25
+#define SYSCALL_COUNT 28
 #define LOGSTR(x) arch_e9_puts(x)
 
 static char *name[] = {
@@ -33,7 +33,9 @@ static char *name[] = {
 	"pipe2",
 	"isatty",
 	"faccessat",
-	"unlinkat"
+	"unlinkat",
+	"ioctl",
+	"mkdirat"
 };
 
 static char *args[] = {
@@ -62,7 +64,9 @@ static char *args[] = {
 	"flags %d", // pipe2
 	"fd %d", // isatty
 	"dirfd %d pathname %s mode %d flags %d", // faccessat
-	"dirfd %d pathname %d flags %d" // unlinkat
+	"dirfd %d pathname %d flags %d", // unlinkat
+	"fd %d request %lu argument %d", // ioctl
+	"dirfd %d path %s mode %o" // mkdirat
 };
 
 #endif

kernel-src/fs/pipefs.c

@@ -238,6 +238,7 @@ static void ctor(scache_t *cache, void *obj) {
 	node->attr.inode = ++currentinode;
 	EVENT_INIT(&node->writeevent);
 	EVENT_INIT(&node->readevent);
+	node->vnode.type = V_TYPE_FIFO;
 }
 
 void pipefs_init() {

kernel-src/sys/syscalls/mkdirat.c

@@ -0,0 +1,62 @@
+#include <kernel/syscalls.h>
+#include <kernel/file.h>
+#include <kernel/vfs.h>
+#include <kernel/alloc.h>
+#include <kernel/abi.h>
+#include <arch/cpu.h>
+
+syscallret_t syscall_mkdirat(context_t *, int dirfd, const char *upath, mode_t mode) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	char *path = alloc(strlen(upath) + 1);
+	if (path == NULL) {
+		ret.errno = ENOMEM;
+		return ret;
+	}
+
+	// TODO safe strcopy
+	strcpy(path, upath);
+
+	vnode_t *dirnode = NULL;
+	file_t *file = NULL;
+	if (*path == '/') {
+		dirnode = sched_getroot();
+	} else if (dirfd == AT_FDCWD) {
+		dirnode = sched_getcwd();
+	} else {
+		file = fd_get(dirfd);
+		if (file == NULL) {
+			ret.errno = EBADF;
+			goto cleanup;
+		}
+
+		dirnode = file->vnode;
+
+		if (dirnode->type != V_TYPE_DIR) {
+			ret.errno = ENOTDIR;
+			goto cleanup;
+		}
+	}
+
+	vattr_t attr = {
+		.mode = mode,
+		.gid = _cpu()->thread->proc->cred.gid,
+		.uid = _cpu()->thread->proc->cred.uid
+	};
+
+	ret.errno = vfs_create(dirnode, path, &attr, V_TYPE_DIR, NULL);
+	ret.ret = ret.errno ? -1 : 0;
+
+	cleanup:
+
+	if (file)
+		fd_release(file);
+	else
+		VOP_RELEASE(dirnode);
+
+	free(path);
+
+	return ret;
+}