diff options
| -rw-r--r-- | 1/fopdrv.c | 6 | ||||
| -rw-r--r-- | 1/main.c | 6 | ||||
| -rw-r--r-- | 1/test/main.c | 38 | ||||
| -rwxr-xr-x | 1/test/test.sh | 10 |
4 files changed, 55 insertions, 5 deletions
@@ -2,16 +2,18 @@ // driver/char/mem.c read_null (/dev/null) ssize_t fop_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { + printk("%s(<file>, <buf>, %lu, <ppos>)\n", __PRETTY_FUNCTION__, count); return 0; } // driver/char/mem.c write_null ssize_t fop_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { + printk("%s(<file>, <buf>, %lu, <ppos>)\n", __PRETTY_FUNCTION__, count); return count; } int fop_open(struct inode * inode, struct file * file) { - printk("%s\n", __PRETTY_FUNCTION__); + printk("%s(<inode>, <file>)\n", __PRETTY_FUNCTION__); return 0; // 0 seems to be a safe return value as it's used in driver/char/mem.c. The // manual page for open(2) says that the system call returns a nonnegative @@ -20,7 +22,7 @@ int fop_open(struct inode * inode, struct file * file) { } int fop_release(struct inode * inode, struct file * file) { - printk("%s\n", __PRETTY_FUNCTION__); + printk("%s(<inode>, <file>)\n", __PRETTY_FUNCTION__); return 0; // same as above, but found in driver/char/lp.c } @@ -53,7 +53,7 @@ static int mod_init(void) { goto free_device; } - printk("%s %d:%d\n", __PRETTY_FUNCTION__, MAJOR(node), MINOR(node)); + printk("%s() -> 0 (%d:%d)\n", __PRETTY_FUNCTION__, MAJOR(node), MINOR(node)); return 0; free_device: @@ -63,7 +63,7 @@ free_cdev: free_class: class_destroy(class); return_err: - printk("%s: %d\n", __PRETTY_FUNCTION__, err); + printk("%s() -> %d\n", __PRETTY_FUNCTION__, err); return err; } @@ -71,7 +71,7 @@ static void mod_exit(void) { device_destroy(class, node); cdev_del(cdev); class_destroy(class); - printk("%s\n", __PRETTY_FUNCTION__); + printk("%s()\n", __PRETTY_FUNCTION__); } module_init(mod_init); diff --git a/1/test/main.c b/1/test/main.c index 7329e16..b87e56c 100644 --- a/1/test/main.c +++ b/1/test/main.c @@ -1,5 +1,8 @@ #include <stdio.h> #include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <string.h> int main(int argc, char** argv) { if (geteuid() != 0) { @@ -13,6 +16,41 @@ int main(int argc, char** argv) { return 1; } + char* dev = argv[1]; + const char* input = "test"; + int fd; + ssize_t bytes; + + fd = open(dev, O_RDWR); + if (-1 == fd) { + fprintf(stderr, "open() failed with code %d\n", errno); + return 1; + } + + bytes = write(fd, input, strlen(input)); + if (-1 == bytes) { + fprintf(stderr, "write() failed with code %d\n", errno); + return 1; + } + fprintf(stderr, "input \"%s\" to %s (%ld bytes succesful)\n", input, dev, bytes); + + char buf[80]; + bytes = read(fd, buf, 80); + if (-1 == bytes) { + fprintf(stderr, "read() failed with code %d\n", errno); + return 1; + } + fprintf(stderr, "output from %s: (%ld bytes)\n", dev, bytes); + if (bytes > 0) { + if (bytes < 80) buf[bytes] = '\0'; // null terminate string for printf + printf("%s\n", buf); + } + + if (-1 == close(fd)) { + fprintf(stderr, "close() failed with code %d\n", errno); + return 1; + } + return 0; } diff --git a/1/test/test.sh b/1/test/test.sh index 18263e6..7dba005 100755 --- a/1/test/test.sh +++ b/1/test/test.sh @@ -10,5 +10,15 @@ if [ $# -eq 0 ] ; then exit 1 fi +DEV="$1" +INPUT="test" + +echo "input \"$INPUT\" to $DEV" >&2 +echo "$INPUT" > "$DEV" +echo "(EC $?)" >&2 + +echo "output from $DEV:" >&2 +cat "$DEV" +echo "(EC $?)" >&2 exit 0 |