Add creat syscall

src/libos/src/fs/syscalls.rs

@@ -97,6 +97,12 @@ pub fn do_timerfd_gettime(fd: FileDesc, curr_value_ptr: *mut itimerspec_t) -> Re
     Ok(0)
 }
 
+pub fn do_creat(path: *const i8, mode: u32) -> Result<isize> {
+    let flags =
+        AccessMode::O_WRONLY as u32 | (CreationFlags::O_CREAT | CreationFlags::O_TRUNC).bits();
+    self::do_open(path, flags, mode)
+}
+
 pub fn do_open(path: *const i8, flags: u32, mode: u32) -> Result<isize> {
     self::do_openat(AT_FDCWD, path, flags, mode)
 }

src/libos/src/syscall/mod.rs

@@ -22,13 +22,13 @@ use util::mem_util::from_user::*;
 
 use crate::exception::do_handle_exception;
 use crate::fs::{
-    do_access, do_chdir, do_chmod, do_chown, do_close, do_dup, do_dup2, do_dup3, do_eventfd,
-    do_eventfd2, do_faccessat, do_fallocate, do_fchdir, do_fchmod, do_fchmodat, do_fchown,
-    do_fchownat, do_fcntl, do_fdatasync, do_fstat, do_fstatat, do_fstatfs, do_fsync, do_ftruncate,
-    do_getcwd, do_getdents, do_getdents64, do_ioctl, do_lchown, do_link, do_linkat, do_lseek,
-    do_lstat, do_mkdir, do_mkdirat, do_mount_rootfs, do_open, do_openat, do_pipe, do_pipe2,
-    do_pread, do_pwrite, do_read, do_readlink, do_readlinkat, do_readv, do_rename, do_renameat,
-    do_rmdir, do_sendfile, do_stat, do_statfs, do_symlink, do_symlinkat, do_sync,
+    do_access, do_chdir, do_chmod, do_chown, do_close, do_creat, do_dup, do_dup2, do_dup3,
+    do_eventfd, do_eventfd2, do_faccessat, do_fallocate, do_fchdir, do_fchmod, do_fchmodat,
+    do_fchown, do_fchownat, do_fcntl, do_fdatasync, do_fstat, do_fstatat, do_fstatfs, do_fsync,
+    do_ftruncate, do_getcwd, do_getdents, do_getdents64, do_ioctl, do_lchown, do_link, do_linkat,
+    do_lseek, do_lstat, do_mkdir, do_mkdirat, do_mount_rootfs, do_open, do_openat, do_pipe,
+    do_pipe2, do_pread, do_pwrite, do_read, do_readlink, do_readlinkat, do_readv, do_rename,
+    do_renameat, do_rmdir, do_sendfile, do_stat, do_statfs, do_symlink, do_symlinkat, do_sync,
     do_timerfd_create, do_timerfd_gettime, do_timerfd_settime, do_truncate, do_unlink, do_unlinkat,
     do_write, do_writev, iovec_t, AsTimer, File, FileDesc, FileRef, HostStdioFds, Stat, Statfs,
 };
@@ -172,7 +172,7 @@ macro_rules! process_syscall_table_with_callback {
             (Rename = 82) => do_rename(oldpath: *const i8, newpath: *const i8),
             (Mkdir = 83) => do_mkdir(path: *const i8, mode: usize),
             (Rmdir = 84) => do_rmdir(path: *const i8),
-            (Creat = 85) => handle_unsupported(),
+            (Creat = 85) => do_creat(path: *const i8, mode: u32),
             (Link = 86) => do_link(oldpath: *const i8, newpath: *const i8),
             (Unlink = 87) => do_unlink(path: *const i8),
             (Symlink = 88) => do_symlink(target: *const i8, link_path: *const i8),

test/open/main.c

@@ -1,3 +1,4 @@
+#include <sys/stat.h>
 #include <fcntl.h>
 #include <errno.h>
 #include "test_fs.h"
@@ -102,6 +103,15 @@ static int __test_openat_with_dirfd(const char *file_path, int flags, int mode)
     return 0;
 }
 
+static int __test_creat(const char *file_path, int flags, int mode) {
+    int fd = creat(file_path, mode);
+    if (fd < 0) {
+        THROW_ERROR("failed to creat a file");
+    }
+    close(fd);
+    return 0;
+}
+
 typedef int(*test_open_func_t)(const char *, int, int);
 
 static int test_open_framework(test_open_func_t fn) {
@@ -138,6 +148,10 @@ static int test_openat_with_dirfd() {
     return test_open_framework(__test_openat_with_dirfd);
 }
 
+static int test_creat() {
+    return test_open_framework(__test_creat);
+}
+
 // ============================================================================
 // Test suite main
 // ============================================================================
@@ -148,6 +162,7 @@ static test_case_t test_cases[] = {
     TEST_CASE(test_open_dir_with_write_flags),
     TEST_CASE(test_openat_with_abs_path),
     TEST_CASE(test_openat_with_dirfd),
+    TEST_CASE(test_creat),
 };
 
 int main(int argc, const char *argv[]) {