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 --- 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;