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tools/nolibc: add getrandom()

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This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-5-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2025-04-28 14:40:06 +02:00 committed by Thomas Weißschuh
parent 55175d8659
commit 801f020b5f
4 changed files with 58 additions and 0 deletions
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1
tools/include/nolibc/Makefile
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@ -48,6 +48,7 @@ all_files := \
sys.h \
sys/auxv.h \
sys/mman.h \
sys/random.h \
sys/stat.h \
sys/syscall.h \
sys/time.h \

1
tools/include/nolibc/nolibc.h
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@ -98,6 +98,7 @@
#include "sys.h"
#include "sys/auxv.h"
#include "sys/mman.h"
#include "sys/random.h"
#include "sys/stat.h"
#include "sys/syscall.h"
#include "sys/time.h"

34
tools/include/nolibc/sys/random.h Normal file
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@ -0,0 +1,34 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* random definitions for NOLIBC
* Copyright (C) 2025 Thomas Weißschuh <thomas.weissschuh@linutronix.de>
*/
/* make sure to include all global symbols */
#include "../nolibc.h"
#ifndef _NOLIBC_SYS_RANDOM_H
#define _NOLIBC_SYS_RANDOM_H
#include "../arch.h"
#include "../sys.h"
#include <linux/random.h>
/*
* ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
*/
static __attribute__((unused))
ssize_t sys_getrandom(void *buf, size_t buflen, unsigned int flags)
{
return my_syscall3(__NR_getrandom, buf, buflen, flags);
}
static __attribute__((unused))
ssize_t getrandom(void *buf, size_t buflen, unsigned int flags)
{
return __sysret(sys_getrandom(buf, buflen, flags));
}
#endif /* _NOLIBC_SYS_RANDOM_H */

22
tools/testing/selftests/nolibc/nolibc-test.c
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@ -20,6 +20,7 @@
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/random.h>
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/stat.h>
@ -807,6 +808,26 @@ static int test_dirent(void)
return 0;
}
int test_getrandom(void)
{
uint64_t rng = 0;
ssize_t ret;
ret = getrandom(&rng, sizeof(rng), GRND_NONBLOCK);
if (ret == -1 && errno == EAGAIN)
return 0; /* No entropy available yet */
if (ret != sizeof(rng))
return ret;
if (!rng) {
errno = EINVAL;
return -1;
}
return 0;
}
int test_getpagesize(void)
{
int x = getpagesize();
@ -1124,6 +1145,7 @@ int run_syscall(int min, int max)
CASE_TEST(getdents64_root); EXPECT_SYSNE(1, test_getdents64("/"), -1); break;
CASE_TEST(getdents64_null); EXPECT_SYSER(1, test_getdents64("/dev/null"), -1, ENOTDIR); break;
CASE_TEST(directories); EXPECT_SYSZR(proc, test_dirent()); break;
CASE_TEST(getrandom); EXPECT_SYSZR(1, test_getrandom()); break;
CASE_TEST(gettimeofday_tv); EXPECT_SYSZR(1, gettimeofday(&tv, NULL)); break;
CASE_TEST(gettimeofday_tv_tz);EXPECT_SYSZR(1, gettimeofday(&tv, &tz)); break;
CASE_TEST(getpagesize); EXPECT_SYSZR(1, test_getpagesize()); break;