[UNIKRAFT PATCH 1/5] lib/vfscore: Register `close` to syscall_shim

[Constantin Raducanu <raducanu.costi@xxxxxxxxx>]

Registers `close` 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        | 9 ++++-----
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/lib/vfscore/Makefile.uk b/lib/vfscore/Makefile.uk
index a3391e6..631f351 100644
--- a/lib/vfscore/Makefile.uk
+++ b/lib/vfscore/Makefile.uk
@@ -29,3 +29,4 @@ UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += write-3 writev-3
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += read-3 readv-3
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += fstat-2
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += readlink-3
+UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += close-1
\ No newline at end of file
diff --git a/lib/vfscore/exportsyms.uk b/lib/vfscore/exportsyms.uk
index 223bb72..cb01f33 100644
--- a/lib/vfscore/exportsyms.uk
+++ b/lib/vfscore/exportsyms.uk
@@ -18,6 +18,8 @@ write
 uk_syscall_e_write
 uk_syscall_r_write
 close
+uk_syscall_e_close
+uk_syscall_r_close
 read
 uk_syscall_e_read
 uk_syscall_r_read
diff --git a/lib/vfscore/main.c b/lib/vfscore/main.c
index 846e2ef..e970df1 100644
--- a/lib/vfscore/main.c
+++ b/lib/vfscore/main.c
@@ -207,22 +207,21 @@ int fdclose(int fd)
        return error;
 }
 
-int close(int fd)
+UK_SYSCALL_R_DEFINE(int, close, int, fd)
 {
        int error;
 
        trace_vfs_close(fd);
        error = fdclose(fd);
        if (error)
-               goto out_errno;
+               goto out_error;
 
        trace_vfs_close_ret();
        return 0;
 
-       out_errno:
+       out_error:
        trace_vfs_close_err(error);
-       errno = error;
-       return -1;
+       return -error;
 }
 
 UK_TRACEPOINT(trace_vfs_mknod, "\"%s\" 0%0o 0x%x", const char*, mode_t, dev_t);
-- 
2.17.1