/* * 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 #include #include #include #include #include #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; sp = kmalloc(sizeof(struct snap), GFP_KERNEL); if (sp == 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, }; e'>summaryrefs log tree commit diff

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