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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include "global.h"
#include "data_stream.h"
#include "line_reader.h"
#include "zbuffer.h"
#define PORT 57575
#define POLLDELAY (10*1000000)
/*struct proc_taskinfo {
uint64_t pti_virtual_size; virtual memory size (bytes)
uint64_t pti_resident_size; resident memory size (bytes)
uint64_t pti_total_user; total time
uint64_t pti_total_system;
uint64_t pti_threads_user; existing threads only
uint64_t pti_threads_system;
int32_t pti_policy; default policy for new threads
int32_t pti_faults; number of page faults
int32_t pti_pageins; number of actual pageins
int32_t pti_cow_faults; number of copy-on-write faults
int32_t pti_messages_sent; number of messages sent
int32_t pti_messages_received; number of messages received
int32_t pti_syscalls_mach; number of mach system calls
int32_t pti_syscalls_unix; number of unix system calls
int32_t pti_csw; number of context switches
int32_t pti_threadnum; number of threads in the task
int32_t pti_numrunning; number of running threads
int32_t pti_priority; task priority
};*/
static i64 make_timestamp(void){
struct timeval tv;
gettimeofday(&tv,NULL);
return tv.tv_sec*(i64)1000000+tv.tv_usec;
}
static void connection_handler(int sock){
struct data_stream *stream=data_stream_init(sock);
struct line_reader *reader=line_reader_init(sock);
i64 polldelay=POLLDELAY;
i64 timeleft=polldelay;
bool do_send_frames=false;
bool do_quit=false;
while(true){
struct timeval timeout={timeleft/1000000,timeleft%1000000};
i64 before=make_timestamp();
fd_set inset;
FD_ZERO(&inset);
FD_SET(sock,&inset);
int ret=select(sock+1,&inset,NULL,NULL,do_send_frames?&timeout:NULL);
if(ret<0){
if(errno==EINTR)continue;
perror("select");
break;
}
if(ret==0||!FD_ISSET(sock,&inset)){ // timeout
if(do_send_frames){
if(data_stream_frame(stream)<0){
printf("Error sending data\n");
goto cleanup;
}
printf("."); fflush(stdout);
}
timeleft=polldelay;
continue;
}
i64 after=make_timestamp();
if(after<before){
printf("Time ran backwards?\n");
after=before;
}
timeleft-=after-before;
if(timeleft<0)timeleft=0;
char buf[1024];
i64 nr=read(sock,buf,sizeof buf);
if(nr<0){
if(errno==EINTR)continue;
perror("read");
break;
}
if(nr==0)break; // EOF
line_reader_supply_data(reader,buf,nr);
char *line;
while((line=line_reader_get_line(reader,false))!=NULL){
char *word=line;
printf("Read <%s>\n",line);
char *next=strchr(word,' ');
if(next!=NULL){
*next='\0';
next++;
}
if(strcmp(word,"delay")==0){
char *endp;
i64 v=strtoll(next,&endp,10);
if(*next=='\0'||*endp!='\0'||v<=1000){
free(line);
printf("Invalid number in delay\n");
continue;
}
polldelay=v;
printf("polldelay -> %" PRIi64 "\n",polldelay);
if(timeleft>polldelay)timeleft=polldelay;
} else if(strcmp(word,"start")==0){
do_send_frames=true;
printf("Sending enabled\n");
} else if(strcmp(word,"stop")==0){
do_send_frames=false;
printf("Sending disabled\n");
} else if(strcmp(word,"flush")==0){
printf("Flushing\n");
if(data_stream_flush(stream)<0){
printf("Error flushing\n");
goto cleanup;
}
} else if(strcmp(word,"quit")==0){
printf("Quitting by request\n");
do_quit=true;
goto cleanup;
} else {
printf("Read unrecognised line <%s>!\n",line);
}
free(line);
}
}
cleanup:
data_stream_finish_destroy(stream);
if(do_quit)exit(0);
}
int main(void){
int sock=socket(PF_INET,SOCK_STREAM,0);
if(sock<0){
perror("socket");
return 1;
}
int one=1;
if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&one,sizeof(int))<0){
perror("setsockopt");
return 1;
}
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=htonl(INADDR_ANY);
sin.sin_port=htons(PORT);
if(bind(sock,(struct sockaddr*)&sin,sizeof(sin))<0){
close(sock);
perror("bind");
return 1;
}
if(listen(sock,1)<0){
perror("listen");
return 1;
}
printf("Listening on port %d\n",PORT);
while(true){
struct sockaddr_storage client_addr;
socklen_t client_addr_sz=sizeof(client_addr);
int clientsock=accept(sock,(struct sockaddr*)&client_addr,&client_addr_sz);
if(clientsock<0){
perror("accept");
continue;
}
char str[INET_ADDRSTRLEN];
inet_ntop(client_addr.ss_family,&((struct sockaddr_in*)&client_addr)->sin_addr,
str,sizeof(str));
printf("Accept from %s\n",str);
connection_handler(clientsock);
close(clientsock);
}
}
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