zircon/system/ulib/launchpad/vmo.c

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <launchpad/vmo.h>
#include <zircon/syscalls.h>
#include <lib/fdio/io.h>

#include <fcntl.h>
#include <string.h>
#include <unistd.h>

zx_status_t launchpad_vmo_from_file(const char* filename, zx_handle_t* out) {
    int fd = open(filename, O_RDONLY);
    if (fd < 0)
        return ZX_ERR_IO;
    zx_handle_t vmo;
    zx_handle_t exec_vmo;
    zx_status_t status = fdio_get_vmo_clone(fd, &vmo);
    close(fd);

    if (status != ZX_OK) {
        return status;
    }

    status = zx_vmo_replace_as_executable(vmo, ZX_HANDLE_INVALID, &exec_vmo);
    if (status != ZX_OK) {
        zx_handle_close(vmo);
        return status;
    }

    if (strlen(filename) >= ZX_MAX_NAME_LEN) {
        const char* p = strrchr(filename, '/');
        if (p != NULL) {
            filename = p + 1;
        }
    }

    status = zx_object_set_property(exec_vmo, ZX_PROP_NAME, filename, strlen(filename));
    if (status != ZX_OK) {
        zx_handle_close(exec_vmo);
        return status;
    }

    *out = exec_vmo;
    return ZX_OK;
}