Add "uname" system call

include/sys/amd64/sys_sys.h

@@ -1,7 +1,9 @@
 #pragma once
+#include "sys/utsname.h"
 #include "sys/types.h"
 #include "sys/time.h"
 
+int sys_uname(struct utsname *name);
 int sys_gettimeofday(struct timeval *tv, struct timezone *tz);
 int sys_nanosleep(const struct timespec *req, struct timespec *rem);
 int sys_reboot(int magic1, int magic2, unsigned int cmd, void *arg);

include/sys/syscall.h

@@ -31,6 +31,7 @@
 #define SYSCALL_NR_SETUID       105
 #define SYSCALL_NR_SETGID       106
 
+#define SYSCALL_NR_UNAME        63
 #define SYSCALL_NR_MOUNT        165
 #define SYSCALL_NR_REBOOT       169
 

include/sys/utsname.h

@@ -0,0 +1,14 @@
+#pragma once
+
+struct utsname {
+    char sysname[16];
+    char nodename[8];
+    char release[16];
+    char version[32];
+    char machine[16];
+    char domainname[64];
+};
+
+#if !defined(__KERNEL__)
+int uname(struct utsname *buf);
+#endif

install-headers.sh

@@ -13,7 +13,8 @@ KERNEL_HEADERS="include/sys/fcntl.h \
                 include/sys/types.h \
                 include/sys/time.h \
                 include/sys/errno.h \
-                include/sys/signum.h"
+                include/sys/signum.h \
+                include/sys/utsname.h"
 
 for src_file in $KERNEL_HEADERS; do
     dst_file=$INSTALL_HDR$(echo $src_file | sed -e 's/^include//g')

sys/amd64/sys_sys.c

@@ -2,6 +2,7 @@
 #include "sys/amd64/hw/rtc.h"
 #include "sys/amd64/cpu.h"
 #include "sys/reboot.h"
+#include "sys/string.h"
 #include "sys/assert.h"
 #include "sys/errno.h"
 #include "sys/sched.h"
@@ -86,3 +87,20 @@ int sys_reboot(int magic1, int magic2, unsigned int cmd, void *arg) {
     }
 }
 
+int sys_uname(struct utsname *name) {
+    if (!name) {
+        return -EFAULT;
+    }
+
+    strcpy(name->sysname, "yggdrasil");
+    // XXX: Hostname is not present in the kernel yet
+    strcpy(name->nodename, "nyan");
+    // XXX: No release numbers yet, only git version
+    strcpy(name->release, "X.Y");
+    strcpy(name->version, KERNEL_VERSION_STR);
+    // It's the only platform I'm developing the kernel for
+    strcpy(name->machine, "x86_64");
+    strcpy(name->domainname, "localhost");
+
+    return 0;
+}

sys/amd64/syscall.c

@@ -44,6 +44,7 @@ const void *amd64_syscall_jmp_table[256] = {
     [SYSCALL_NR_GETGID] = sys_getgid,
 
     // System
+    [SYSCALL_NR_UNAME] = sys_uname,
     [SYSCALL_NR_MOUNT] = sys_mount,
     [SYSCALL_NR_REBOOT] = sys_reboot,
     [SYSCALL_NR_NANOSLEEP] = sys_nanosleep,