posix: device_io: use mode argument correctly in open()

Previously, we had only used the flags field and ignored mode
with the open() function.

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

include/zephyr/posix/fcntl.h

@@ -8,9 +8,13 @@
 #define ZEPHYR_POSIX_FCNTL_H_
 
 #ifdef CONFIG_PICOLIBC
-#define O_CREAT 0x0040
+#define O_CREAT  0x0040
+#define O_TRUNC  0x0200
+#define O_APPEND 0x0400
 #else
-#define O_CREAT 0x0200
+#define O_APPEND 0x0008
+#define O_CREAT  0x0200
+#define O_TRUNC  0x0400
 #endif
 
 #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
@@ -19,7 +23,6 @@
 #define O_WRONLY 01
 #define O_RDWR	 02
 
-#define O_APPEND   0x0400
 #define O_EXCL	   0x0800
 #define O_NONBLOCK 0x4000
 

lib/posix/options/device_io.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdint.h>
 
+#include <zephyr/posix/fcntl.h>
 #include <zephyr/posix/poll.h>
 #include <zephyr/posix/unistd.h>
 #include <zephyr/posix/sys/select.h>
@@ -16,28 +17,28 @@
 int zvfs_close(int fd);
 FILE *zvfs_fdopen(int fd, const char *mode);
 int zvfs_fileno(FILE *file);
-int zvfs_open(const char *name, int flags);
+int zvfs_open(const char *name, int flags, int mode);
 ssize_t zvfs_read(int fd, void *buf, size_t sz, size_t *from_offset);
 ssize_t zvfs_write(int fd, const void *buf, size_t sz, size_t *from_offset);
 
 void FD_CLR(int fd, struct zvfs_fd_set *fdset)
 {
-	return ZVFS_FD_CLR(fd, (struct zvfs_fd_set *)fdset);
+	return ZVFS_FD_CLR(fd, fdset);
 }
 
 int FD_ISSET(int fd, struct zvfs_fd_set *fdset)
 {
-	return ZVFS_FD_ISSET(fd, (struct zvfs_fd_set *)fdset);
+	return ZVFS_FD_ISSET(fd, fdset);
 }
 
 void FD_SET(int fd, struct zvfs_fd_set *fdset)
 {
-	ZVFS_FD_SET(fd, (struct zvfs_fd_set *)fdset);
+	ZVFS_FD_SET(fd, fdset);
 }
 
 void FD_ZERO(fd_set *fdset)
 {
-	ZVFS_FD_ZERO((struct zvfs_fd_set *)fdset);
+	ZVFS_FD_ZERO(fdset);
 }
 
 int close(int fd)
@@ -60,8 +61,16 @@ int fileno(FILE *file)
 
 int open(const char *name, int flags, ...)
 {
-	/* FIXME: necessarily need to check for O_CREAT and unpack ... if set */
-	return zvfs_open(name, flags);
+	int mode = 0;
+	va_list args;
+
+	if ((flags & O_CREAT) != 0) {
+		va_start(args, flags);
+		mode = va_arg(args, int);
+		va_end(args);
+	}
+
+	return zvfs_open(name, flags, mode);
 }
 #ifdef CONFIG_POSIX_DEVICE_IO_ALIAS_OPEN
 FUNC_ALIAS(open, _open, int);

lib/posix/options/fs.c

@@ -59,37 +59,22 @@ static inline void posix_fs_free_obj(struct posix_fs_desc *ptr)
 	ptr->used = false;
 }
 
-static int posix_mode_to_zephyr(int mf)
-{
-	int mode = (mf & O_CREAT) ? FS_O_CREATE : 0;
-
-	mode |= (mf & O_APPEND) ? FS_O_APPEND : 0;
-
-	switch (mf & O_ACCMODE) {
-	case O_RDONLY:
-		mode |= FS_O_READ;
-		break;
-	case O_WRONLY:
-		mode |= FS_O_WRITE;
-		break;
-	case O_RDWR:
-		mode |= FS_O_RDWR;
-		break;
-	default:
-		break;
-	}
-
-	return mode;
-}
-
-int zvfs_open(const char *name, int flags)
+int zvfs_open(const char *name, int flags, int mode)
 {
 	int rc, fd;
 	struct posix_fs_desc *ptr = NULL;
-	int zmode = posix_mode_to_zephyr(flags);
+	int zflags = 0;
+
+	if ((flags & O_ACCMODE) == O_RDONLY) {
+		zflags |= FS_O_READ;
+	} else if ((flags & O_ACCMODE) == O_WRONLY) {
+		zflags |= FS_O_WRITE;
+	} else if ((flags & O_ACCMODE) == O_RDWR) {
+		zflags |= FS_O_RDWR;
+	}
 
-	if (zmode < 0) {
-		return zmode;
+	if ((flags & O_APPEND) != 0) {
+		zflags |= FS_O_APPEND;
 	}
 
 	fd = zvfs_reserve_fd();
@@ -99,24 +84,44 @@ int zvfs_open(const char *name, int flags)
 
 	ptr = posix_fs_alloc_obj(false);
 	if (ptr == NULL) {
-		zvfs_free_fd(fd);
-		errno = EMFILE;
-		return -1;
+		rc = -EMFILE;
+		goto out_err;
 	}
 
 	fs_file_t_init(&ptr->file);
 
-	rc = fs_open(&ptr->file, name, zmode);
+	if (flags & O_CREAT) {
+		flags &= ~O_CREAT;
 
+		rc = fs_open(&ptr->file, name, FS_O_CREATE | (mode & O_ACCMODE));
+		if (rc < 0) {
+			goto out_err;
+		}
+		rc = fs_close(&ptr->file);
+		if (rc < 0) {
+			goto out_err;
+		}
+	}
+
+	rc = fs_open(&ptr->file, name, zflags);
 	if (rc < 0) {
-		posix_fs_free_obj(ptr);
-		zvfs_free_fd(fd);
-		errno = -rc;
-		return -1;
+		goto out_err;
 	}
 
 	zvfs_finalize_fd(fd, ptr, &fs_fd_op_vtable);
 
+	goto out;
+
+out_err:
+	if (ptr != NULL) {
+		posix_fs_free_obj(ptr);
+	}
+
+	zvfs_free_fd(fd);
+	errno = -rc;
+	return -1;
+
+out:
 	return fd;
 }
 

tests/posix/fs/src/test_fs_dir.c

@@ -27,7 +27,7 @@ static int test_mkdir(void)
 		return res;
 	}
 
-	res = open(TEST_DIR_FILE, O_CREAT | O_RDWR);
+	res = open(TEST_DIR_FILE, O_CREAT | O_RDWR, 0770);
 
 	if (res < 0) {
 		TC_PRINT("Failed opening file [%d]\n", res);

tests/posix/fs/src/test_fs_file.c

@@ -16,7 +16,7 @@ static int test_file_open(void)
 {
 	int res;
 
-	res = open(TEST_FILE, O_CREAT | O_RDWR);
+	res = open(TEST_FILE, O_CREAT | O_RDWR, 0660);
 	if (res < 0) {
 		TC_ERROR("Failed opening file: %d, errno=%d\n", res, errno);
 		/* FIXME: restructure tests as per #46897 */

tests/posix/fs/src/test_fs_open_flags.c

@@ -60,7 +60,7 @@ static int test_file_open_flags(void)
 
 	/* 2 Create file for read only, attempt to read, attempt to write */
 	TC_PRINT("Open on non-existent file, flags = O_CREAT | O_WRONLY\n");
-	fd = open(THE_FILE, O_CREAT | O_WRONLY);
+	fd = open(THE_FILE, O_CREAT | O_WRONLY, 0440);
 	if (fd < 0) {
 		TC_PRINT("Expected success; fd = %d, errno = %d\n", fd, errno);
 		return TC_FAIL;
@@ -236,7 +236,7 @@ static int test_file_open_flags(void)
 	TC_PRINT("Attempt write to file opened with O_APPEND | O_RDWR\n");
 	/* Clean start */
 	unlink(THE_FILE);
-	fd = open(THE_FILE, O_CREAT | O_WRONLY);
+	fd = open(THE_FILE, O_CREAT | O_WRONLY, 0440);
 	if (fd < 0) {
 		TC_PRINT("Expected success, fd = %d, errno = %d\n", fd, errno);
 		return TC_FAIL;

tests/posix/fs/src/test_fs_stat.c

@@ -21,7 +21,7 @@ static void create_file(const char *filename, uint32_t size)
 {
 	int fh;
 
-	fh = open(filename, O_CREAT | O_WRONLY);
+	fh = open(filename, O_CREAT | O_WRONLY, 0440);
 	zassert(fh >= 0, "Failed creating test file");
 
 	uint8_t filling[FILL_SIZE];