[libc-commits] [libc] [libc] implement pathconf/fpathconf (PR #87165)
Nhat Nguyen via libc-commits
libc-commits at lists.llvm.org
Sat Mar 30 11:14:37 PDT 2024
https://github.com/changkhothuychung created https://github.com/llvm/llvm-project/pull/87165
None
>From f428a360c32273516999042bb18416fa1a1db35a Mon Sep 17 00:00:00 2001
From: changkhothuychung <nhat7203 at gmail.com>
Date: Sat, 30 Mar 2024 14:10:47 -0400
Subject: [PATCH] intiial attempt
---
libc/config/linux/aarch64/entrypoints.txt | 2 +
libc/config/linux/riscv/entrypoints.txt | 2 +
libc/config/linux/x86_64/entrypoints.txt | 2 +
libc/src/unistd/CMakeLists.txt | 14 +++++
libc/src/unistd/linux/CMakeLists.txt | 26 +++++++++
libc/src/unistd/linux/pathconf.cpp | 68 +++++++++++++++++++++++
libc/src/unistd/pathconf.h | 20 +++++++
7 files changed, 134 insertions(+)
create mode 100644 libc/src/unistd/linux/pathconf.cpp
create mode 100644 libc/src/unistd/pathconf.h
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 78da7f0b334b1f..be0c4bebfd95ad 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -282,6 +282,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.dup3
libc.src.unistd.execve
libc.src.unistd.fchdir
+ libc.src.unistd.fpathconf
libc.src.unistd.fsync
libc.src.unistd.ftruncate
libc.src.unistd.getcwd
@@ -293,6 +294,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.link
libc.src.unistd.linkat
libc.src.unistd.lseek
+ libc.src.unistd.pathconf
libc.src.unistd.pread
libc.src.unistd.pwrite
libc.src.unistd.read
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 5aae4e246cfb3c..2d8f9b1f6dd82c 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -287,6 +287,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.dup3
libc.src.unistd.execve
libc.src.unistd.fchdir
+ libc.src.unistd.fpathconf
libc.src.unistd.fsync
libc.src.unistd.ftruncate
libc.src.unistd.getcwd
@@ -298,6 +299,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.link
libc.src.unistd.linkat
libc.src.unistd.lseek
+ libc.src.unistd.pathconf
libc.src.unistd.pread
libc.src.unistd.pwrite
libc.src.unistd.read
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 5b428e51aee620..0f00f264ea1490 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -297,6 +297,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.dup3
libc.src.unistd.execve
libc.src.unistd.fchdir
+ libc.src.unistd.fpathconf
libc.src.unistd.fsync
libc.src.unistd.ftruncate
libc.src.unistd.getcwd
@@ -308,6 +309,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.link
libc.src.unistd.linkat
libc.src.unistd.lseek
+ libc.src.unistd.pathconf
libc.src.unistd.pread
libc.src.unistd.pwrite
libc.src.unistd.read
diff --git a/libc/src/unistd/CMakeLists.txt b/libc/src/unistd/CMakeLists.txt
index e22b0e1872caa1..20c87f668b381b 100644
--- a/libc/src/unistd/CMakeLists.txt
+++ b/libc/src/unistd/CMakeLists.txt
@@ -58,6 +58,13 @@ add_entrypoint_object(
.${LIBC_TARGET_OS}.fork
)
+add_entrypoint_object(
+ fpathconf
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.fpathconf
+)
+
add_entrypoint_object(
execv
ALIAS
@@ -149,6 +156,13 @@ add_entrypoint_object(
.${LIBC_TARGET_OS}.lseek
)
+add_entrypoint_object(
+ pathconf
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.pathconf
+)
+
add_entrypoint_object(
pread
ALIAS
diff --git a/libc/src/unistd/linux/CMakeLists.txt b/libc/src/unistd/linux/CMakeLists.txt
index df85d44e9e9edc..0ee59d5391ac5e 100644
--- a/libc/src/unistd/linux/CMakeLists.txt
+++ b/libc/src/unistd/linux/CMakeLists.txt
@@ -105,6 +105,19 @@ add_entrypoint_object(
libc.src.errno.errno
)
+add_entrypoint_object(
+ fpathconf
+ SRCS
+ fpathconf.cpp
+ HDRS
+ ../fpathconf.h
+ DEPENDS
+ libc.include.unistd
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
add_entrypoint_object(
execv
SRCS
@@ -273,6 +286,19 @@ add_entrypoint_object(
libc.src.errno.errno
)
+add_entrypoint_object(
+ pathconf
+ SRCS
+ pathconf.cpp
+ HDRS
+ ../pathconf.h
+ DEPENDS
+ libc.include.unistd
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
add_entrypoint_object(
pread
SRCS
diff --git a/libc/src/unistd/linux/pathconf.cpp b/libc/src/unistd/linux/pathconf.cpp
new file mode 100644
index 00000000000000..fed94e7d423716
--- /dev/null
+++ b/libc/src/unistd/linux/pathconf.cpp
@@ -0,0 +1,68 @@
+//===-- Linux implementation of pathconf ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/unistd/pread.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+#include "src/__support/macros/sanitizer.h" // for MSAN_UNPOISON
+#include "src/errno/libc_errno.h"
+#include <stdint.h> // For uint64_t.
+#include <sys/statvfs.h>
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE {
+
+static long pathconfig(const struct statvfs &s, int name) {
+ switch (name) {
+ case _PC_LINK_MAX:
+ return _POSIX_LINK_MAX;
+
+ case _PC_MAX_CANON:
+ return _POSIX_MAX_CANON;
+
+ case _PC_MAX_INPUT:
+ return _POSIX_MAX_INPUT;
+
+ case _PC_NAME_MAX:
+ return _POSIX_NAME_MAX;
+
+ case _PC_PATH_MAX:
+ return _POSIX_PATH_MAX;
+
+ case _PC_PIPE_BUF:
+ return _POSIX_PIPE_BUF;
+
+ case _PC_CHOWN_RESTRICTED:
+ return _POSIX_CHOWN_RESTRICTED;
+
+ case _PC_NO_TRUNC:
+ return _POSIX_NO_TRUNC;
+
+ case _PC_VDISABLE:
+ return _POSIX_VDISABLE;
+ }
+}
+
+LLVM_LIBC_FUNCTION(long, pathconf, (char *path, int name)) {
+ struct statvfs sb;
+ if (statvfs(path, &sb) == -1) {
+ return -1;
+ }
+ return pathconfig(sb, name);
+}
+
+LLVM_LIBC_FUNCTION(long, fpathconf, (int fd, int name)) {
+ struct statvfs sb;
+ if (statvfs(path, &sb) == -1) {
+ return -1;
+ }
+ return pathconfig(sb, name);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/unistd/pathconf.h b/libc/src/unistd/pathconf.h
new file mode 100644
index 00000000000000..a397cd9323bbb8
--- /dev/null
+++ b/libc/src/unistd/pathconf.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for pathconf ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_UNISTD_PREAD_H
+#define LLVM_LIBC_SRC_UNISTD_PREAD_H
+
+#include <unistd.h>
+
+namespace LIBC_NAMESPACE {
+
+long pathconf(char *path, int name);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_UNISTD_PREAD_H
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