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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /drivers/usb/mon/mon_stat.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'drivers/usb/mon/mon_stat.c')
-rw-r--r-- | drivers/usb/mon/mon_stat.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/usb/mon/mon_stat.c b/drivers/usb/mon/mon_stat.c new file mode 100644 index 00000000..ebd6189a --- /dev/null +++ b/drivers/usb/mon/mon_stat.c @@ -0,0 +1,69 @@ +/* + * The USB Monitor, inspired by Dave Harding's USBMon. + * + * This is the 's' or 'stat' reader which debugs usbmon itself. + * Note that this code blows through locks, so make sure that + * /dbg/usbmon/0s is well protected from non-root users. + * + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/usb.h> +#include <linux/fs.h> +#include <asm/uaccess.h> + +#include "usb_mon.h" + +#define STAT_BUF_SIZE 80 + +struct snap { + int slen; + char str[STAT_BUF_SIZE]; +}; + +static int mon_stat_open(struct inode *inode, struct file *file) +{ + struct mon_bus *mbus; + struct snap *sp; + + if ((sp = kmalloc(sizeof(struct snap), GFP_KERNEL)) == NULL) + return -ENOMEM; + + mbus = inode->i_private; + + sp->slen = snprintf(sp->str, STAT_BUF_SIZE, + "nreaders %d events %u text_lost %u\n", + mbus->nreaders, mbus->cnt_events, mbus->cnt_text_lost); + + file->private_data = sp; + return 0; +} + +static ssize_t mon_stat_read(struct file *file, char __user *buf, + size_t nbytes, loff_t *ppos) +{ + struct snap *sp = file->private_data; + + return simple_read_from_buffer(buf, nbytes, ppos, sp->str, sp->slen); +} + +static int mon_stat_release(struct inode *inode, struct file *file) +{ + struct snap *sp = file->private_data; + file->private_data = NULL; + kfree(sp); + return 0; +} + +const struct file_operations mon_fops_stat = { + .owner = THIS_MODULE, + .open = mon_stat_open, + .llseek = no_llseek, + .read = mon_stat_read, + /* .write = mon_stat_write, */ + /* .poll = mon_stat_poll, */ + /* .unlocked_ioctl = mon_stat_ioctl, */ + .release = mon_stat_release, +}; |