[Qemu-devel] Re: [PATCH] linux-user unlinkat() syscall

[Thayne Harbaugh <thayne@c2.net>]

[-- Attachment #1: Type: text/plain, Size: 52 bytes --]

This patch adds the unlinkat syscall to linux-user.

[-- Attachment #2: 28_unlinkat.patch --]
[-- Type: text/x-patch, Size: 2046 bytes --]

Index: qemu/linux-user/syscall.c
===================================================================
--- qemu.orig/linux-user/syscall.c	2007-09-19 06:22:58.000000000 -0600
+++ qemu/linux-user/syscall.c	2007-09-19 06:23:52.000000000 -0600
@@ -163,6 +163,7 @@
 #define __NR_sys_syslog __NR_syslog
 #define __NR_sys_tgkill __NR_tgkill
 #define __NR_sys_tkill __NR_tkill
+#define __NR_sys_unlinkat __NR_unlinkat
 #define __NR_sys_utimensat __NR_utimensat
 
 #if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__)
@@ -216,6 +217,9 @@
 #if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
 _syscall1(int,set_tid_address,int *,tidptr)
 #endif
+#if defined(TARGET_NR_unlinkat) && defined(__NR_unlinkat)
+_syscall3(int,sys_unlinkat,int,dirfd,const char *,pathname,int,flags)
+#endif
 #if defined(TARGET_NR_utimensat) && defined(__NR_utimensat)
 _syscall4(int,sys_utimensat,int,dirfd,const char *,pathname,
           const struct timespec *,tsp,int,flags)
@@ -2762,6 +2766,21 @@
         ret = get_errno(unlink(p));
         unlock_user(p, arg1, 0);
         break;
+#if defined(TARGET_NR_unlinkat) && defined(__NR_unlinkat)
+    case TARGET_NR_unlinkat:
+        if (!arg2) {
+            ret = -EFAULT;
+            goto fail;
+        }
+        p = lock_user_string(arg2);
+        if (!access_ok(VERIFY_READ, p, 1))
+            ret = -EFAULT;
+        else
+            ret = get_errno(sys_unlinkat(arg1, p, arg3));
+        if (p)
+            unlock_user(p, arg2, 0);
+        break;
+#endif
     case TARGET_NR_execve:
         {
             char **argp, **envp;
Index: qemu/linux-user/arm/syscall_nr.h
===================================================================
--- qemu.orig/linux-user/arm/syscall_nr.h	2007-09-19 06:22:15.000000000 -0600
+++ qemu/linux-user/arm/syscall_nr.h	2007-09-19 06:23:07.000000000 -0600
@@ -330,4 +330,5 @@
 #define TARGET_NR_mknodat			324
 #define TARGET_NR_fchownat			325
 #define TARGET_NR_futimesat			326
+#define TARGET_NR_unlinkat			328
 #define TARGET_NR_utimensat			348