new: 内核态fork

kernel/common/Makefile

@@ -3,7 +3,7 @@ CFLAGS += -I .
 
 kernel_common_subdirs:=libELF math
 
-all: glib.o printk.o cpu.o bitree.o kfifo.o wait_queue.o mutex.o wait.o
+all: glib.o printk.o cpu.o bitree.o kfifo.o wait_queue.o mutex.o wait.o unistd.o
 	@list='$(kernel_common_subdirs)'; for subdir in $$list; do \
     		echo "make all in $$subdir";\
     		cd $$subdir;\
@@ -33,4 +33,7 @@ mutex.o: mutex.c
 	gcc $(CFLAGS) -c mutex.c -o mutex.o
 
 wait.o: sys/wait.c
-	gcc $(CFLAGS) -c sys/wait.c -o sys/wait.o
+	gcc $(CFLAGS) -c sys/wait.c -o sys/wait.o
+
+unistd.o: unistd.c
+	gcc $(CFLAGS) -c unistd.c -o unistd.o

kernel/common/unistd.c

@@ -0,0 +1,21 @@
+#include <common/unistd.h>
+
+/**
+ * @brief fork当前进程
+ *
+ * @return pid_t
+ */
+pid_t fork(void)
+{
+    return (pid_t)enter_syscall_int(SYS_FORK, 0, 0, 0, 0, 0, 0, 0, 0);
+}
+
+/**
+ * @brief vfork当前进程
+ *
+ * @return pid_t
+ */
+pid_t vfork(void)
+{
+    return (pid_t)enter_syscall_int(SYS_VFORK, 0, 0, 0, 0, 0, 0, 0, 0);
+}

kernel/common/unistd.h

@@ -12,3 +12,17 @@
 
 #include <syscall/syscall.h>
 #include <syscall/syscall_num.h>
+
+/**
+ * @brief fork当前进程
+ *
+ * @return pid_t
+ */
+pid_t fork(void);
+
+/**
+ * @brief vfork当前进程
+ *
+ * @return pid_t
+ */
+pid_t vfork(void);