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

[Constantin Raducanu <raducanu.costi@xxxxxxxxx>]

Registers `truncate` system call to syscall_shim library.

Signed-off-by: Constantin Raducanu <raducanu.costi@xxxxxxxxx>
---
 lib/vfscore/Makefile.uk   |  3 ++-
 lib/vfscore/exportsyms.uk |  2 ++
 lib/vfscore/main.c        | 16 +++++++++-------
 3 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/lib/vfscore/Makefile.uk b/lib/vfscore/Makefile.uk
index 6580573..662a2c8 100644
--- a/lib/vfscore/Makefile.uk
+++ b/lib/vfscore/Makefile.uk
@@ -32,4 +32,5 @@ UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += readlink-3
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += close-1
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += lseek-3
 UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += link-2
-UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += ftruncate-2
\ No newline at end of file
+UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += ftruncate-2
+UK_PROVIDED_SYSCALLS-$(CONFIG_LIBVFSCORE) += truncate-2
\ No newline at end of file
diff --git a/lib/vfscore/exportsyms.uk b/lib/vfscore/exportsyms.uk
index 158386b..2805b73 100644
--- a/lib/vfscore/exportsyms.uk
+++ b/lib/vfscore/exportsyms.uk
@@ -72,6 +72,8 @@ uk_syscall_e_readv
 uk_syscall_r_readv
 writev
 truncate
+uk_syscall_e_truncate
+uk_syscall_r_truncate
 mknod
 preadv
 ioctl
diff --git a/lib/vfscore/main.c b/lib/vfscore/main.c
index 2600dd2..1bcafe0 100644
--- a/lib/vfscore/main.c
+++ b/lib/vfscore/main.c
@@ -1694,7 +1694,7 @@ UK_TRACEPOINT(trace_vfs_truncate, "\"%s\" 0x%x", const 
char*, off_t);
 UK_TRACEPOINT(trace_vfs_truncate_ret, "");
 UK_TRACEPOINT(trace_vfs_truncate_err, "%d", int);
 
-int truncate(const char *pathname, off_t length)
+UK_SYSCALL_R_DEFINE(int, truncate, const char*, pathname, off_t, length)
 {
        trace_vfs_truncate(pathname, length);
        struct task *t = main_task;
@@ -1703,19 +1703,21 @@ int truncate(const char *pathname, off_t length)
 
        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_truncate(path, length);
        if (error)
-               goto out_errno;
+               goto out_error;
+
        trace_vfs_truncate_ret();
        return 0;
-       out_errno:
-       errno = error;
+
+       out_error:
        trace_vfs_truncate_err(error);
-       return -1;
+       return -error;
 }
 
 LFS64(truncate);
-- 
2.17.1