[UNIKRAFT PATCH 04/10] lib/vfscore: Register `chmod` to syscall_shim

[Constantin Raducanu <raducanu.costi@xxxxxxxxx>]

Registers `chmod` system call to syscall_shim library.

Signed-off-by: Constantin Raducanu <raducanu.costi@xxxxxxxxx>
---
 lib/vfscore/Makefile.uk   |  1 +
 lib/vfscore/exportsyms.uk |  2 ++
 lib/vfscore/main.c        | 14 +++++++-------
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/lib/vfscore/Makefile.uk b/lib/vfscore/Makefile.uk
index 1cae643..8fef26e 100644
--- a/lib/vfscore/Makefile.uk
+++ b/lib/vfscore/Makefile.uk
@@ -37,3 +37,4 @@ UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += truncate-2
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += access-2
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += faccessat-4
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += fallocate-4
+UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += chmod-2
diff --git a/lib/vfscore/exportsyms.uk b/lib/vfscore/exportsyms.uk
index b897aa7..30e6aba 100644
--- a/lib/vfscore/exportsyms.uk
+++ b/lib/vfscore/exportsyms.uk
@@ -37,6 +37,8 @@ uk_syscall_e_ftruncate
 uk_syscall_r_ftruncate
 stat
 chmod
+uk_syscall_e_chmod
+uk_syscall_r_chmod
 fchmod
 fchown
 dup
diff --git a/lib/vfscore/main.c b/lib/vfscore/main.c
index eb007b9..aa688b8 100644
--- a/lib/vfscore/main.c
+++ b/lib/vfscore/main.c
@@ -1978,25 +1978,25 @@ UK_TRACEPOINT(trace_vfs_chmod, "\"%s\" 0%0o", const 
char*, mode_t);
 UK_TRACEPOINT(trace_vfs_chmod_ret, "");
 UK_TRACEPOINT(trace_vfs_chmod_err, "%d", int);
 
-int chmod(const char *pathname, mode_t mode)
+UK_SYSCALL_R_DEFINE(int, chmod, const char*, pathname, mode_t, mode)
 {
        trace_vfs_chmod(pathname, mode);
        struct task *t = main_task;
        char path[PATH_MAX];
        int error = ENOENT;
        if (pathname == NULL)
-               goto out_errno;
+               goto out_error;
        if ((error = task_conv(t, pathname, VWRITE, path)) != 0)
-               goto out_errno;
+               goto out_error;
        error = sys_chmod(path, mode & UK_ALLPERMS);
        if (error)
-               goto out_errno;
+               goto out_error;
        trace_vfs_chmod_ret();
        return 0;
-out_errno:
+
+out_error:
        trace_vfs_chmod_err(error);
-       errno = error;
-       return -1;
+       return -error;
 }
 
 UK_TRACEPOINT(trace_vfs_fchmod, "\"%d\" 0%0o", int, mode_t);
-- 
2.17.1