(linux) std/sys: add Fstat

Author: mertcandav

std/sys/syscall_linux_amd64.jule

@@ -578,6 +578,13 @@ fn Lstat(path: str, mut &stat: *SysStat)! {
 	Fstatat(AT_FDCWD, path, stat, AT_SYMLINK_NOFOLLOW)?
 }
 
+fn Fstat(fd: int, mut &stat: *SysStat)! {
+	_, e := syscall(SYS_FSTAT, uintptr(fd), uintptr(stat), 0, 0, 0, 0)
+	if e != _NO_ERROR {
+		throw e
+	}
+}
+
 fn Ftruncate(fd: int, length: i64)! {
 	_, e := syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0, 0, 0, 0)
 	if e != _NO_ERROR {

std/sys/syscall_linux_arm64.jule

@@ -582,6 +582,13 @@ fn Lstat(path: str, mut &stat: *SysStat)! {
 	Fstatat(AT_FDCWD, path, stat, AT_SYMLINK_NOFOLLOW)?
 }
 
+fn Fstat(fd: int, mut &stat: *SysStat)! {
+	_, e := syscall(SYS_FSTAT, uintptr(fd), uintptr(stat), 0, 0, 0, 0)
+	if e != _NO_ERROR {
+		throw e
+	}
+}
+
 fn Ftruncate(fd: int, length: i64)! {
 	_, e := syscall(SYS_FTRUNCATE, uintptr(fd), uintptr(length), 0, 0, 0, 0)
 	if e != _NO_ERROR {

std/sys/syscall_linux_i386.jule

@@ -610,6 +610,13 @@ fn Lstat(path: str, mut &stat: *SysStat)! {
 	}
 }
 
+fn Fstat(fd: int, mut &stat: *SysStat)! {
+	_, e := syscall(SYS_FSTAT64, uintptr(fd), uintptr(stat), 0, 0, 0, 0)
+	if e != _NO_ERROR {
+		throw e
+	}
+}
+
 fn Ftruncate(fd: int, length: i64)! {
 	_, e := syscall(SYS_FTRUNCATE64, uintptr(fd), uintptr(length>>32), 0, 0, 0, 0)
 	if e != _NO_ERROR {