github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 18:13:41 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

tools/nolibc: add fopen()

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

Only the standard POSIX modes are supported.
No extensions nor the (noop) "b" from ISO C are accepted.

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-v2-13-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2025-04-28 14:40:14 +02:00 committed by Thomas Weißschuh
parent 256dc7339d
commit a009a0c6fa
2 changed files with 51 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
tools/include/nolibc/stdio.h
View File

@ -13,6 +13,7 @@
#include "std.h"
#include "arch.h"
#include "errno.h"
#include "fcntl.h"
#include "types.h"
#include "sys.h"
#include "stdarg.h"
@ -55,6 +56,32 @@ FILE *fdopen(int fd, const char *mode __attribute__((unused)))
return (FILE*)(intptr_t)~fd;
}
static __attribute__((unused))
FILE *fopen(const char *pathname, const char *mode)
{
int flags, fd;
switch (*mode) {
case 'r':
flags = O_RDONLY;
break;
case 'w':
flags = O_WRONLY | O_CREAT | O_TRUNC;
break;
case 'a':
flags = O_WRONLY | O_CREAT | O_APPEND;
break;
default:
SET_ERRNO(EINVAL); return NULL;
}
if (mode[1] == '+')
flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
fd = open(pathname, flags, 0666);
return fdopen(fd, mode);
}
/* provides the fd of stream. */
static __attribute__((unused))
int fileno(FILE *stream)

24
tools/testing/selftests/nolibc/nolibc-test.c
View File

@ -859,6 +859,29 @@ int test_getpagesize(void)
return !c;
}
int test_file_stream(void)
{
FILE *f;
int r;
f = fopen("/dev/null", "r");
if (!f)
return -1;
errno = 0;
r = fwrite("foo", 1, 3, f);
if (r != 0 || errno != EBADF) {
fclose(f);
return -1;
}
r = fclose(f);
if (r == EOF)
return -1;
return 0;
}
int test_fork(void)
{
int status;
@ -1311,6 +1334,7 @@ int run_syscall(int min, int max)
CASE_TEST(dup3_0); tmp = dup3(0, 100, 0); EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
CASE_TEST(dup3_m1); tmp = dup3(-1, 100, 0); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
CASE_TEST(execve_root); EXPECT_SYSER(1, execve("/", (char*[]){ [0] = "/", [1] = NULL }, NULL), -1, EACCES); break;
CASE_TEST(file_stream); EXPECT_SYSZR(1, test_file_stream()); break;
CASE_TEST(fork); EXPECT_SYSZR(1, test_fork()); break;
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;