From bfbf9682fe38c3b29e51913464674770869c6970 Mon Sep 17 00:00:00 2001
From: hinus <hinus@163.com>
Date: Tue, 17 Aug 2021 11:35:46 +0800
Subject: [PATCH] Title: System call getgroups Issue:
 https://gitee.com/hinus/linux_kernel_011/issues/I45YA6 Description: System
 call getgroups LTT: rm

---
 include/asm/segment.h |  2 ++
 include/linux/sys.h   |  4 ++--
 include/unistd.h      |  1 +
 kernel/printk.c       |  2 +-
 kernel/segment.c      |  4 ++++
 kernel/sys.c          | 15 +++++++++++++++
 6 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/include/asm/segment.h b/include/asm/segment.h
index faf0d1b..fe41e78 100644
--- a/include/asm/segment.h
+++ b/include/asm/segment.h
@@ -5,6 +5,8 @@ inline unsigned char get_fs_byte(const char * addr);
 
 inline void put_fs_byte(char val,char *addr);
 
+inline void put_fs_word(short val, short * addr) ;
+
 inline unsigned long get_fs_long(const unsigned long *addr) ;
 
 inline void put_fs_long(unsigned long val,unsigned long * addr) ;
diff --git a/include/linux/sys.h b/include/linux/sys.h
index b5b5dcc..b341c0e 100644
--- a/include/linux/sys.h
+++ b/include/linux/sys.h
@@ -78,7 +78,7 @@ extern int sys_sigaction();
 //extern int sys_getrusage();
 extern int sys_gettimeofday();
 //extern int sys_settimeofday();
-//extern int sys_getgroups();
+extern int sys_getgroups();
 //extern int sys_setgroups();
 //extern int sys_select();
 //extern int sys_symlink();
@@ -177,7 +177,7 @@ fn_ptr sys_call_table[] = {
     0, //    sys_getrusage,
     sys_gettimeofday,
     0, //    sys_settimeofday,
-    0, //    sys_getgroups,
+    sys_getgroups,
     0, //    sys_setgroups,
     0, //    sys_select,
     0, //    sys_symlink,
diff --git a/include/unistd.h b/include/unistd.h
index de15641..ced7413 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -161,6 +161,7 @@ int execve(const char * filename, char ** argv, char ** envp);
 int fcntl(int fildes, int cmd, ...);
 int fork();
 int fstat();
+int getgroups(int gidsetlen, gid_t *gidset);
 int gettimeofday(struct timeval *tv, struct timezone *tz);
 int setup(void *BIOS);
 int sync();
diff --git a/kernel/printk.c b/kernel/printk.c
index 17ddc4d..c6f8510 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -31,7 +31,7 @@ int printk(const char* fmt, ...) {
 
 void print_sys(int index) {
     int i;
-    int filter[] = {3, 4, 5, 6, 18, 29, 45, 48, 54};
+    int filter[] = {3, 4, 5, 6, 18, 29, 45, 48, 54, 80};
 
     for (i = 0; i < sizeof(filter) / sizeof(int); i++) {
         if (index == filter[i])
diff --git a/kernel/segment.c b/kernel/segment.c
index 35b9414..54dd69e 100644
--- a/kernel/segment.c
+++ b/kernel/segment.c
@@ -10,6 +10,10 @@ inline void put_fs_byte(char val,char *addr) {
     __asm__ ("movb %0,%%fs:%1"::"r" (val),"m" (*addr));
 }
 
+inline void put_fs_word(short val, short *addr) {
+    __asm__ ("movw %0,%%fs:%1"::"r" (val),"m" (*addr));
+}
+
 inline unsigned long get_fs_long(const unsigned long *addr) {
     unsigned long _v;
     __asm__ ("movl %%fs:%1,%0":"=r" (_v):"m" (*addr));
diff --git a/kernel/sys.c b/kernel/sys.c
index 09e4480..b0b89b8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -130,6 +130,21 @@ int sys_ulimit() {
     return -ENOSYS;
 }
 
+int sys_getgroups(int gidsetsize, gid_t *grouplist) {
+    int     i;
+    if (gidsetsize)
+        verify_area(grouplist, sizeof(gid_t) * gidsetsize);
+    for (i = 0; (i < NGROUPS) && (current->groups[i] != NOGROUP);
+            i++, grouplist++) {
+        if (gidsetsize) {
+            if (i >= gidsetsize)
+                return -EINVAL;
+            put_fs_word(current->groups[i], (short *) grouplist);
+        }
+    }
+    return i;
+}
+
 int sys_brk(unsigned long end_data_seg) {
     if (end_data_seg >= current->end_code &&
             end_data_seg < current->start_stack - 16384)
-- 
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