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.weisssc...@linutronix.de>
---
tools/include/nolibc/stdio.h | 27 +++++++++++++++++++++++++++
tools/testing/selftests/nolibc/nolibc-test.c | 24 ++++++++++++++++++++++++
2 files changed, 51 insertions(+)
diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index
02426682c34bcd82d9556036c6c3e73a6a5a3b4d..86a1132abcd4e5e5b0f821cfe974aca8a6d4966f
100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -10,6 +10,7 @@
#include "std.h"
#include "arch.h"
#include "errno.h"
+#include "fcntl.h"
#include "types.h"
#include "sys.h"
#include "stdarg.h"
@@ -52,6 +53,32 @@ 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;
+
+ if (!strcmp(mode, "r"))
+ flags = O_RDONLY;
+ else if (!strcmp(mode, "w"))
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
+ else if (!strcmp(mode, "a"))
+ flags = O_WRONLY | O_CREAT | O_APPEND;
+ else if (!strcmp(mode, "r+"))
+ flags = O_RDWR;
+ else if (!strcmp(mode, "w+"))
+ flags = O_RDWR | O_CREAT | O_TRUNC;
+ else if (!strcmp(mode, "a+"))
+ flags = O_RDWR | O_CREAT | O_APPEND;
+ else {
+ SET_ERRNO(EINVAL);
+ return NULL;
+ }
+
+ fd = open(pathname, flags, 0666);
+ return fdopen(fd, mode);
+}
+
/* provides the fd of stream. */
static __attribute__((unused))
int fileno(FILE *stream)
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c
b/tools/testing/selftests/nolibc/nolibc-test.c
index
ab9c3bcffd9750981d68c6d16245d285ce0657c8..f576edc3725b42ce086d6d83d989f38d3fab6eb8
100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -856,6 +856,29 @@ 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;
@@ -1308,6 +1331,7 @@ 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;
--
2.49.0
