函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\printk\printk.c Create Date:2022-07-27 11:06:25
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：syslog_print

函数原型：static int syslog_print(char __user *buf, int size)

返回类型：int

参数：

类型参数名称
char __user *buf
intsize
1354  len等于0
1356  text等于开辟内存
1357  如果非text则返回:负ENOMEM
1360  当size大于0循环
1364  Helper macros to lock/unlock logbuf_lock and switch between* printk-safe/unsafe modes.()
1365  如果he next printk record to read by syslog(READ) or /proc/kmsg 小于dex and sequence number of the first record stored in the buffer 则
1367  he next printk record to read by syslog(READ) or /proc/kmsg 等于dex and sequence number of the first record stored in the buffer
1368  syslog_idx等于log_first_idx
1369  syslog_partial等于0
1371  如果he next printk record to read by syslog(READ) or /proc/kmsg 恒等于dex and sequence number of the next record to store in the buffer 则
1372  logbuf_unlock_irq()
1373  退出
1380  如果非syslog_partial则syslog_time等于printk_time
1383  skip等于syslog_partial
1384  msg等于get record by index; idx must point to valid msg
1385  n等于msg_print_text(msg, true, syslog_time, text, LOG_LINE_MAX + PREFIX_MAX)
1387  如果n减syslog_partial小于等于size则
1389  syslog_idx等于get next record; idx must point to valid msg
1390  he next printk record to read by syslog(READ) or /proc/kmsg 自加
1391  n减等于syslog_partial
1392  syslog_partial等于0
1393  否则如果非len则
1395  n等于size
1396  syslog_partial加等于n
1397  否则n等于0
1399  logbuf_unlock_irq()
1401  如果非n则退出
1404  如果copy_to_user(buf, text + skip, n)则
1405  如果非len则len等于负EFAULT
1407  退出
1410  len加等于n
1411  size减等于n
1412  buf加等于n
1415  释放内存
1416  返回:len
调用者
名称描述
do_syslog