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| True | False | - | Line | Source |
| 1 | /* | |||
| 2 | * The USB Monitor, inspired by Dave Harding's USBMon. | |||
| 3 | * | |||
| 4 | * This is the 's' or 'stat' reader which debugs usbmon itself. | |||
| 5 | * Note that this code blows through locks, so make sure that | |||
| 6 | * /dbg/usbmon/0s is well protected from non-root users. | |||
| 7 | * | |||
| 8 | */ | |||
| 9 | ||||
| 10 | #include <linux/kernel.h> | |||
| 11 | #include <linux/usb.h> | |||
| 12 | #include <asm/uaccess.h> | |||
| 13 | ||||
| 14 | #include "usb_mon.h" | |||
| 15 | ||||
| 16 | #define STAT_BUF_SIZE 80 | |||
| 17 | ||||
| 18 | struct snap { | |||
| 19 | int slen; | |||
| 20 | char str[STAT_BUF_SIZE]; | |||
| 21 | }; | |||
| 22 | ||||
| 0 | 0 | - | 23 | static int mon_stat_open(struct inode *inode, struct file *file) |
| 24 | { | |||
| 25 | struct mon_bus *mbus; | |||
| 26 | struct snap *sp; | |||
| 27 | ||||
| 0 | 0 | - | 28 | if ((sp = kmalloc(sizeof(struct snap), GFP_KERNEL)) == NULL) |
| 0 | - | 29 | return -ENOMEM; | |
| 30 | ||||
| 31 | mbus = inode->u.generic_ip; | |||
| 32 | ||||
| 33 | sp->slen = snprintf(sp->str, STAT_BUF_SIZE, | |||
| 34 | "nreaders %d text_lost %u\n", | |||
| 35 | mbus->nreaders, mbus->cnt_text_lost); | |||
| 36 | ||||
| 37 | file->private_data = sp; | |||
| 0 | - | 38 | return 0; | |
| 39 | } | |||
| 40 | ||||
| 0 | 0 | - | 41 | static ssize_t mon_stat_read(struct file *file, char __user *buf, |
| 42 | size_t nbytes, loff_t *ppos) | |||
| 43 | { | |||
| 44 | struct snap *sp = file->private_data; | |||
| 45 | loff_t pos = *ppos; | |||
| 46 | int cnt; | |||
| 47 | ||||
| 0 | 0 | - | 48 | if (pos < 0 || pos >= sp->slen) |
| 0 | - | 48 | T || _ | |
| 0 | - | 48 | F || T | |
| 0 | - | 48 | F || F | |
| 0 | - | 49 | return 0; | |
| 0 | 0 | - | 50 | if (nbytes == 0) |
| 0 | - | 51 | return 0; | |
| 0 | 0 | - | 52 | if ((cnt = sp->slen - pos) > nbytes) |
| 53 | cnt = nbytes; | |||
| 0 | 0 | - | 54 | if (copy_to_user(buf, sp->str + pos, cnt)) |
| 0 | - | 55 | return -EFAULT; | |
| 56 | *ppos = pos + cnt; | |||
| 0 | - | 57 | return cnt; | |
| 58 | } | |||
| 59 | ||||
| 0 | 0 | - | 60 | static int mon_stat_release(struct inode *inode, struct file *file) |
| 61 | { | |||
| 0 | - | 62 | return 0; | |
| 63 | } | |||
| 64 | ||||
| 65 | struct file_operations mon_fops_stat = { | |||
| 66 | .owner = THIS_MODULE, | |||
| 67 | .open = mon_stat_open, | |||
| 68 | .llseek = no_llseek, | |||
| 69 | .read = mon_stat_read, | |||
| 70 | /* .write = mon_stat_write, */ | |||
| 71 | /* .poll = mon_stat_poll, */ | |||
| 72 | /* .ioctl = mon_stat_ioctl, */ | |||
| 73 | .release = mon_stat_release, | |||
| 74 | }; | |||
| ***TER 0% (0/23) of SOURCE FILE mon_stat.c | ||||