Added lseek to syscalls

src/platform/src/linux/mod.rs

@@ -119,6 +119,10 @@ pub fn link(path1: *const c_char, path2: *const c_char) -> c_int {
     e(unsafe { syscall!(LINKAT, AT_FDCWD, path1, AT_FDCWD, path2, 0) }) as c_int
 }
 
+pub fn lseek(fildes: c_int, offset: off_t, whence: c_int) -> off_t {
+    e(unsafe { syscall!(LSEEK, fildes, offset, whence) }) as off_t
+}
+
 pub fn mkdir(path: *const c_char, mode: mode_t) -> c_int {
     e(unsafe { syscall!(MKDIRAT, AT_FDCWD, path, mode) }) as c_int
 }

src/platform/src/redox/mod.rs

@@ -125,6 +125,10 @@ pub fn link(path1: *const c_char, path2: *const c_char) -> c_int {
     e(unsafe { syscall::link(path1.as_ptr(), path2.as_ptr()) }) as c_int
 }
 
+pub fn lseek(fd: c_int, offset: isize, whence: usize) -> c_int {
+    e(syscall::lseek(fd as usize, offset, whence)) as c_int
+}
+
 pub fn mkdir(path: *const c_char, mode: mode_t) -> c_int {
     let flags = O_CREAT | O_EXCL | O_CLOEXEC | O_DIRECTORY | mode as usize & 0o777;
     let path = unsafe { c_str(path) };