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trace-agent.h
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1 #ifndef __TRACE_AGENT_H__
2 #define __TRACE_AGENT_H__
3 #include <pthread.h>
4 #include <stdbool.h>
5 
6 #define MAX_CPUS 256
7 #define PIPE_INIT (1024*1024)
8 
9 /*
10  * agent_info - structure managing total information of guest agent
11  * @pipe_size: size of pipe (default 1MB)
12  * @use_stdout: set to true when o option is added (default false)
13  * @cpus: total number of CPUs
14  * @ctl_fd: fd of control path, /dev/virtio-ports/agent-ctl-path
15  * @rw_ti: structure managing information of read/write threads
16  */
17 struct agent_info {
18  unsigned long pipe_size;
19  bool use_stdout;
20  int cpus;
21  int ctl_fd;
23 };
24 
25 /*
26  * rw_thread_info - structure managing a read/write thread a cpu
27  * @cpu_num: cpu number operating this read/write thread
28  * @in_fd: fd of reading trace data path in cpu_num
29  * @out_fd: fd of writing trace data path in cpu_num
30  * @read_pipe: fd of read pipe
31  * @write_pipe: fd of write pipe
32  * @pipe_size: size of pipe (default 1MB)
33  */
35  int cpu_num;
36  int in_fd;
37  int out_fd;
38  int read_pipe;
40  unsigned long pipe_size;
41 };
42 
43 /* use for stopping rw threads */
44 extern bool global_sig_receive;
45 
46 /* use for notification */
47 extern bool global_run_operation;
48 extern pthread_mutex_t mutex_notify;
49 extern pthread_cond_t cond_wakeup;
50 
51 /* for controller of read/write threads */
52 extern int rw_ctl_init(const char *ctl_path);
53 extern void *rw_ctl_loop(int ctl_fd);
54 
55 /* for trace read/write thread */
56 extern void *rw_thread_info_new(void);
57 extern void *rw_thread_init(int cpu, const char *in_path, const char *out_path,
58  bool stdout_flag, unsigned long pipe_size,
59  struct rw_thread_info *rw_ti);
60 extern pthread_t rw_thread_run(struct rw_thread_info *rw_ti);
61 
62 static inline void *zalloc(size_t size)
63 {
64  return calloc(1, size);
65 }
66 
67 #define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
68 #define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
69 #ifdef DEBUG
70 #define pr_debug(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
71 #else
72 #define pr_debug(format, ...) do {} while (0)
73 #endif
74 
75 #endif /*__TRACE_AGENT_H__*/