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tools/nolibc: add uio.h with readv and writev

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This is generally useful and struct iovec is also needed for other
purposes such as ptrace.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Benjamin Berg
2025-09-24 16:20:57 +02:00
committed by Thomas Weißschuh
parent 3d66c4e14f
commit 4bb30188c7
4 changed files with 60 additions and 0 deletions
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1
tools/include/nolibc/Makefile
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@@ -62,6 +62,7 @@ all_files := \
sys/time.h \
sys/timerfd.h \
sys/types.h \
sys/uio.h \
sys/utsname.h \
sys/wait.h \
time.h \

1
tools/include/nolibc/nolibc.h
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@@ -109,6 +109,7 @@
#include "sys/sysmacros.h"
#include "sys/time.h"
#include "sys/timerfd.h"
#include "sys/uio.h"
#include "sys/utsname.h"
#include "sys/wait.h"
#include "ctype.h"

49
tools/include/nolibc/sys/uio.h Normal file
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@@ -0,0 +1,49 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* uio for NOLIBC
* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
* Copyright (C) 2025 Intel Corporation
*/
/* make sure to include all global symbols */
#include "../nolibc.h"
#ifndef _NOLIBC_SYS_UIO_H
#define _NOLIBC_SYS_UIO_H
#include "../sys.h"
#include <linux/uio.h>
/*
* ssize_t readv(int fd, const struct iovec *iovec, int count);
*/
static __attribute__((unused))
ssize_t sys_readv(int fd, const struct iovec *iovec, int count)
{
return my_syscall3(__NR_readv, fd, iovec, count);
}
static __attribute__((unused))
ssize_t readv(int fd, const struct iovec *iovec, int count)
{
return __sysret(sys_readv(fd, iovec, count));
}
/*
* ssize_t writev(int fd, const struct iovec *iovec, int count);
*/
static __attribute__((unused))
ssize_t sys_writev(int fd, const struct iovec *iovec, int count)
{
return my_syscall3(__NR_writev, fd, iovec, count);
}
static __attribute__((unused))
ssize_t writev(int fd, const struct iovec *iovec, int count)
{
return __sysret(sys_writev(fd, iovec, count));
}
#endif /* _NOLIBC_SYS_UIO_H */

9
tools/testing/selftests/nolibc/nolibc-test.c
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@@ -25,6 +25,7 @@
#include <sys/sysmacros.h>
#include <sys/time.h>
#include <sys/timerfd.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <dirent.h>
@@ -1282,6 +1283,10 @@ int run_syscall(int min, int max)
int proc;
int test;
int tmp;
struct iovec iov_one = {
.iov_base = &tmp,
.iov_len = 1,
};
int ret = 0;
void *p1, *p2;
int has_gettid = 1;
@@ -1395,6 +1400,10 @@ int run_syscall(int min, int max)
CASE_TEST(waitpid_child); EXPECT_SYSER(1, waitpid(getpid(), &tmp, WNOHANG), -1, ECHILD); break;
CASE_TEST(write_badf); EXPECT_SYSER(1, write(-1, &tmp, 1), -1, EBADF); break;
CASE_TEST(write_zero); EXPECT_SYSZR(1, write(1, &tmp, 0)); break;
CASE_TEST(readv_badf); EXPECT_SYSER(1, readv(-1, &iov_one, 1), -1, EBADF); break;
CASE_TEST(readv_zero); EXPECT_SYSZR(1, readv(1, NULL, 0)); break;
CASE_TEST(writev_badf); EXPECT_SYSER(1, writev(-1, &iov_one, 1), -1, EBADF); break;
CASE_TEST(writev_zero); EXPECT_SYSZR(1, writev(1, NULL, 0)); break;
CASE_TEST(syscall_noargs); EXPECT_SYSEQ(1, syscall(__NR_getpid), getpid()); break;
CASE_TEST(syscall_args); EXPECT_SYSER(1, syscall(__NR_statx, 0, NULL, 0, 0, NULL), -1, EFAULT); break;
CASE_TEST(namespace); EXPECT_SYSZR(euid0 && proc, test_namespace()); break;