syscalls: ftruncate

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

@@ -35,6 +35,7 @@ extern syscall_fchmodat
 extern syscall_umask
 extern syscall_poll
 extern syscall_nanosleep
+extern syscall_ftruncate
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -72,7 +73,8 @@ dq syscall_fchmodat
 dq syscall_umask
 dq syscall_poll
 dq syscall_nanosleep
-syscallcount equ 36
+dq syscall_ftruncate
+syscallcount equ 37
 section .text
 global arch_syscall_entry
 ; on entry:

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

@@ -43,7 +43,8 @@ static char *name[] = {
 	"fchmodat",
 	"umask",
 	"poll",
-	"nanosleep"
+	"nanosleep",
+	"ftruncate"
 };
 
 static char *args[] = {
@@ -82,7 +83,8 @@ static char *args[] = {
 	"dirfd %d path %s mode %o flags %d", // fchmodat
 	"mode %o", // umask
 	"fds %p nfds %d timeout %d", // poll
-	"time %p remaining %p" // nanosleep
+	"time %p remaining %p", // nanosleep
+	"fd %d size %lu" // ftruncate
 };
 
 #endif

kernel-src/sys/syscalls/truncate.c

@@ -0,0 +1,27 @@
+#include <kernel/syscalls.h>
+
+syscallret_t syscall_ftruncate(int fd, size_t size) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	file_t *file = fd_get(fd);
+	if (file == NULL) {
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	if ((file->flags & FILE_WRITE) == 0 || file->vnode->type != V_TYPE_REGULAR) {
+		ret.errno = EINVAL;
+		goto cleanup;
+	}
+
+	ret.errno = VOP_RESIZE(file->vnode, size, &_cpu()->thread->proc->cred);
+	ret.ret = ret.errno ? -1 : 0;
+
+	cleanup:
+
+	fd_release(file);
+
+	return ret;	
+}

patches/mlibc/jinx-working-patch.patch

@@ -133,10 +133,10 @@ index 0000000..e5b087a
 +
 diff --git mlibc-workdir/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp
 new file mode 100644
-index 0000000..22db6d2
+index 0000000..f7b6375
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
-@@ -0,0 +1,438 @@
+@@ -0,0 +1,443 @@
 +#include <bits/ensure.h>
 +#include <mlibc/debug.hpp>
 +#include <mlibc/all-sysdeps.hpp>
@@ -216,6 +216,11 @@ index 0000000..22db6d2
 +		return 0;
 +	}
 +
++	int sys_ftruncate(int fd, size_t size) {
++		long ret;
++		return syscall(SYSCALL_FTRUNCATE, &ret, fd, size);
++	}
++
 +	int sys_sleep(time_t *secs, long *nanos) {
 +		struct timespec ts;
 +		ts.tv_sec = *secs;
@@ -594,10 +599,10 @@ index 0000000..990eca0
 +#endif
 diff --git mlibc-workdir/sysdeps/astral/include/astral/syscall.h mlibc-workdir/sysdeps/astral/include/astral/syscall.h
 new file mode 100644
-index 0000000..4426771
+index 0000000..76b4800
 --- /dev/null
 +++ mlibc-workdir/sysdeps/astral/include/astral/syscall.h
-@@ -0,0 +1,59 @@
+@@ -0,0 +1,60 @@
 +#ifndef _SYSCALL_H_INCLUDE
 +#define _SYSCALL_H_INCLUDE
 +
@@ -637,6 +642,7 @@ index 0000000..4426771
 +#define SYSCALL_UMASK 33
 +#define SYSCALL_POLL 34
 +#define SYSCALL_NANOSLEEP 35
++#define SYSCALL_FTRUNCATE 36
 +
 +#include <stddef.h>
 +#include <stdint.h>