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[PATCH v2 02/11] bsd-user: Implement symlink, symlinkat, readlink and re
From: |
Warner Losh |
Subject: |
[PATCH v2 02/11] bsd-user: Implement symlink, symlinkat, readlink and readlinkat |
Date: |
Fri, 24 Jun 2022 15:47:33 -0600 |
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Jung-uk Kim <jkim@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
bsd-user/bsd-file.h | 74 +++++++++++++++++++++++++++++++++++
bsd-user/freebsd/os-syscall.c | 16 ++++++++
2 files changed, 90 insertions(+)
diff --git a/bsd-user/bsd-file.h b/bsd-user/bsd-file.h
index a0f03102639..635ac8d0e62 100644
--- a/bsd-user/bsd-file.h
+++ b/bsd-user/bsd-file.h
@@ -601,4 +601,78 @@ static abi_long do_bsd_nmount(abi_long arg1, abi_long
count,
return ret;
}
+/* symlink(2) */
+static abi_long do_bsd_symlink(abi_long arg1, abi_long arg2)
+{
+ abi_long ret;
+ void *p1, *p2;
+
+ LOCK_PATH2(p1, arg1, p2, arg2);
+ ret = get_errno(symlink(p1, p2)); /* XXX path(p1), path(p2) */
+ UNLOCK_PATH2(p1, arg1, p2, arg2);
+
+ return ret;
+}
+
+/* symlinkat(2) */
+static abi_long do_bsd_symlinkat(abi_long arg1, abi_long arg2,
+ abi_long arg3)
+{
+ abi_long ret;
+ void *p1, *p2;
+
+ LOCK_PATH2(p1, arg1, p2, arg3);
+ ret = get_errno(symlinkat(p1, arg2, p2)); /* XXX path(p1), path(p2) */
+ UNLOCK_PATH2(p1, arg1, p2, arg3);
+
+ return ret;
+}
+
+/* readlink(2) */
+static abi_long do_bsd_readlink(CPUArchState *env, abi_long arg1,
+ abi_long arg2, abi_long arg3)
+{
+ abi_long ret;
+ void *p1, *p2;
+
+ LOCK_PATH(p1, arg1);
+ p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
+ if (p2 == NULL) {
+ UNLOCK_PATH(p1, arg1);
+ return -TARGET_EFAULT;
+ }
+ if (strcmp(p1, "/proc/curproc/file") == 0) {
+ CPUState *cpu = env_cpu(env);
+ TaskState *ts = (TaskState *)cpu->opaque;
+ strncpy(p2, ts->bprm->fullpath, arg3);
+ ret = MIN((abi_long)strlen(ts->bprm->fullpath), arg3);
+ } else {
+ ret = get_errno(readlink(path(p1), p2, arg3));
+ }
+ unlock_user(p2, arg2, ret);
+ UNLOCK_PATH(p1, arg1);
+
+ return ret;
+}
+
+/* readlinkat(2) */
+static abi_long do_bsd_readlinkat(abi_long arg1, abi_long arg2,
+ abi_long arg3, abi_long arg4)
+{
+ abi_long ret;
+ void *p1, *p2;
+
+ LOCK_PATH(p1, arg2);
+ p2 = lock_user(VERIFY_WRITE, arg3, arg4, 0);
+ if (p2 == NULL) {
+ UNLOCK_PATH(p1, arg2);
+ return -TARGET_EFAULT;
+ }
+ ret = get_errno(readlinkat(arg1, p1, p2, arg4));
+ unlock_user(p2, arg3, ret);
+ UNLOCK_PATH(p1, arg2);
+
+ return ret;
+}
+
#endif /* BSD_FILE_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index bd4dfa6ddc7..80ec9dd4954 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -386,6 +386,22 @@ static abi_long freebsd_syscall(void *cpu_env, int num,
abi_long arg1,
ret = do_bsd_nmount(arg1, arg2, arg3);
break;
+ case TARGET_FREEBSD_NR_symlink: /* symlink(2) */
+ ret = do_bsd_symlink(arg1, arg2);
+ break;
+
+ case TARGET_FREEBSD_NR_symlinkat: /* symlinkat(2) */
+ ret = do_bsd_symlinkat(arg1, arg2, arg3);
+ break;
+
+ case TARGET_FREEBSD_NR_readlink: /* readlink(2) */
+ ret = do_bsd_readlink(cpu_env, arg1, arg2, arg3);
+ break;
+
+ case TARGET_FREEBSD_NR_readlinkat: /* readlinkat(2) */
+ ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4);
+ break;
+
default:
qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
ret = -TARGET_ENOSYS;
--
2.33.1
- [PATCH v2 00/11] bsd-user: More file-related system calls, Warner Losh, 2022/06/24
- [PATCH v2 01/11] bsd-user: Implement mount, umount and nmount, Warner Losh, 2022/06/24
- [PATCH v2 03/11] bsd-user: implement chmod, fchmod, lchmod and fchmodat, Warner Losh, 2022/06/24
- [PATCH v2 02/11] bsd-user: Implement symlink, symlinkat, readlink and readlinkat,
Warner Losh <=
- [PATCH v2 04/11] bsd-user: Implement freebsd11_mknod, freebsd11_mknodat and mknodat, Warner Losh, 2022/06/24
- [PATCH v2 07/11] bsd-user: Implement chroot and flock, Warner Losh, 2022/06/24
- [PATCH v2 10/11] bsd-user: Implement undelete, Warner Losh, 2022/06/24
- [PATCH v2 08/11] bsd-user: Implement mkfifo and mkfifoat, Warner Losh, 2022/06/24
- [PATCH v2 09/11] bsd-user: Implement pathconf, lpathconf and fpathconf, Warner Losh, 2022/06/24
- [PATCH v2 05/11] bsd-user: Implement chown, fchown, lchown and fchownat, Warner Losh, 2022/06/24
- [PATCH v2 06/11] bsd-user: Implement chflags, lchflags and fchflags, Warner Losh, 2022/06/24
- [PATCH v2 11/11] bsd-user: Remove stray 'inline' from do_bsd_close, Warner Losh, 2022/06/24