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 --- tools/include/nolibc/stdio.h | 20 ++++++++++++++++++++ tools/testing/selftests/nolibc/nolibc-test.c | 24 ++++++++++++++++++++++++ 2 files changed, 44 insertions(+)
diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h index df5717d591826c8468e3473581ac0d6e76629aa3..61b7252ab6d04f8758367f5265687146326456a3 100644 --- a/tools/include/nolibc/stdio.h +++ b/tools/include/nolibc/stdio.h @@ -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 +56,25 @@ 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) diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index d1157319b5d715dbc94ff9203b1d2a2e932aabcf..0391c7d01380ea2f20d1d07497ea1964bcb6a9f4 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -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;