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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include "../config.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif /* HAVE_SIGNAL_H */
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif /* HAVE_SYS_SOCKET_H */
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */
#ifdef HAVE_SYS_UN_H
# include <sys/un.h>
#endif /* HAVE_SYS_UN_H */
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif /* HAVE_SYS_WAIT_H */
#include "rccexternal.h"
#include "internal.h"
#define RCC_EXT_PROG_NAME "rccexternal"
#define RCC_EXTERNAL_TIMEOUT 250 /* 100us */
static pid_t pid = (pid_t)-1;
static char *addr = NULL;
int rccExternalInit() {
#ifdef HAVE_SIGNAL_H
struct sigaction act;
#endif /* HAVE_SIGNAL_H */
if (pid != (pid_t)-1) return 0;
if (!addr) {
addr = (char*)malloc(strlen(rcc_home_dir)+32);
if (!addr) return -1;
}
pid = fork();
if (pid) {
if (pid == (pid_t)-1) return -1;
sprintf(addr,"%s/.rcc/comm/%lu.sock", rcc_home_dir, (unsigned long)pid);
#ifdef HAVE_SIGNAL_H
act.sa_handler = SIG_IGN;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGPIPE,&act,NULL);
#endif /* HAVE_SIGNAL_H */
return 0;
}
execl(LIBRCC_DATA_DIR "/" RCC_EXT_PROG_NAME, RCC_EXT_PROG_NAME, NULL);
exit(1);
}
void rccExternalFree() {
int retry;
pid_t res;
struct timespec timeout = { 0, 5000000 };
if (pid == (pid_t)-1) return;
for (retry = 0; retry < 3; retry++) {
rccExternalConnect(0);
nanosleep(&timeout, NULL);
res = waitpid(pid, NULL, WNOHANG);
if (res) break;
else timeout.tv_nsec*10;
}
pid = (pid_t)-1;
if (addr) free(addr);
}
static int rccExternalSetDeadline(struct timeval *tv, unsigned long timeout) {
/*
gettimeofday(tv, NULL);
tv->tv_sec += (tv->tv_usec + timeout + RCC_EXTERNAL_TIMEOUT) / 1000000;
tv->tv_usec = (tv->tv_usec + timeout + RCC_EXTERNAL_TIMEOUT) % 1000000;
*/
tv->tv_sec = (timeout + RCC_EXTERNAL_TIMEOUT) / 1000000;
tv->tv_usec = (timeout + RCC_EXTERNAL_TIMEOUT) % 1000000;
return 0;
}
size_t rccExternalWrite(int s, const char *buffer, ssize_t size, unsigned long timeout) {
int err;
unsigned char connected = 1;
ssize_t writed, res = 0;
struct timeval tv;
fd_set fdcon;
if (s == -1) return -1;
for (writed = 0; ((writed < size)&&(connected)); writed += connected?res:0) {
FD_ZERO(&fdcon);
FD_SET(s, &fdcon);
rccExternalSetDeadline(&tv, timeout);
err = select(s+1,NULL,&fdcon,NULL,&tv);
if (err<=0) connected = 0;
else {
res = write(s, buffer + writed, size - writed);
if (res<=0) connected = 0;
}
}
return size - writed;
}
size_t rccExternalRead(int s, char *buffer, ssize_t size, unsigned long timeout) {
int err;
unsigned char connected = 1;
ssize_t readed, res = 0;
struct timeval tv;
fd_set fdcon;
if (s == -1) return -1;
for (readed = 0; ((readed < size)&&(connected)); readed += connected?res:0) {
FD_ZERO(&fdcon);
FD_SET(s, &fdcon);
rccExternalSetDeadline(&tv, timeout);
err = select(s+1,&fdcon,NULL,NULL,&tv);
if (err<=0) connected = 0;
else {
res = read(s, buffer + readed, size - readed);
if (res<=0) connected = 0;
}
}
return size - readed;
}
int rccExternalConnect(unsigned char module) {
int err;
int retries = 10;
int sock;
int flags;
struct sockaddr_un mysock;
struct timeval tv;
struct timespec ts;
fd_set fdcon;
if (pid == (pid_t)-1) return -1;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock<=0) return -1;
flags = fcntl(sock,F_GETFL,0);
if (flags<0) flags = 0;
if (fcntl(sock,F_SETFL,flags|O_NONBLOCK)<0) {
close(sock);
return -1;
}
memset(&mysock, 0, sizeof(mysock));
mysock.sun_family=AF_UNIX;
strncpy(mysock.sun_path,addr,sizeof(mysock.sun_path));
mysock.sun_path[sizeof(mysock.sun_path)-1]=0;
again:
if (connect(sock,(struct sockaddr*)&mysock,sizeof(mysock))<0) {
if (errno == EINPROGRESS) {
FD_ZERO(&fdcon);
FD_SET(sock, &fdcon);
rccExternalSetDeadline(&tv, 0);
err = select(sock+1,&fdcon,NULL,NULL,&tv);
if (err<=0) {
close(sock);
return -1;
}
} else if ((errno == ENOENT)&&(retries)) {
ts.tv_sec = (RCC_EXTERNAL_TIMEOUT/10) / 1000000;
ts.tv_nsec = ((RCC_EXTERNAL_TIMEOUT/10) % 1000000)*1000;
nanosleep(&ts, NULL);
retries--;
goto again;
} else {
close(sock);
return -1;
}
}
if (rccExternalWrite(sock, &module, 1, 0)) {
close(sock);
return -1;
}
return sock;
}
void rccExternalClose(int s) {
unsigned char cmd = 0;
if (s != -1) {
write(s, &cmd, 1);
close(s);
}
}
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