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🆕 在shell中启动另一个程序

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This commit is contained in:
fslongjin
2022-06-07 23:18:26 +08:00
parent 129d24296b
commit 4e04ab9eee
14 changed files with 109 additions and 77 deletions
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10
kernel/syscall/syscall.c
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@ -361,7 +361,7 @@ uint64_t sys_lseek(struct pt_regs *regs)
uint64_t sys_fork(struct pt_regs *regs)
{
kdebug("sys_fork");
// kdebug("sys_fork");
return do_fork(regs, 0, regs->rsp, 0);
}
uint64_t sys_vfork(struct pt_regs *regs)
@ -560,13 +560,13 @@ uint64_t sys_getdents(struct pt_regs *regs)
*/
uint64_t sys_execve(struct pt_regs *regs)
{
kdebug("sys_execve");
// kdebug("sys_execve");
char *user_path = (char *)regs->r8;
char **argv = (char **)regs->r9;
int path_len = strnlen_user(user_path, PAGE_4K_SIZE);
kdebug("path_len=%d", path_len);
// kdebug("path_len=%d", path_len);
if (path_len >= PAGE_4K_SIZE)
return -ENAMETOOLONG;
else if (path_len <= 0)
@ -578,12 +578,12 @@ uint64_t sys_execve(struct pt_regs *regs)
memset(path, 0, path_len + 1);
kdebug("before copy file path from user");
// kdebug("before copy file path from user");
// 拷贝文件路径
strncpy_from_user(path, user_path, path_len);
path[path_len] = '\0';
kdebug("before do_execve, path = %s", path);
// kdebug("before do_execve, path = %s", path);
// 执行新的程序
uint64_t retval = do_execve(regs, path, argv, NULL);