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utils.c
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utils.c
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/*
* MUSCLE SmartCard Development ( https://www.linuxnet.com )
*
* Copyright (C) 2006-2011
* Ludovic Rousseau <[email protected]>
*
* $Id$
*/
/**
* @file
* @brief utility functions
*/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <dirent.h>
#include <fcntl.h>
#include <pthread.h>
#include "config.h"
#include "debuglog.h"
#include "utils.h"
#include "pcscd.h"
#include "sys_generic.h"
pid_t GetDaemonPid(void)
{
int fd;
pid_t pid;
/* pids are only 15 bits but 4294967296
* (32 bits in case of a new system use it) is on 10 bytes
*/
fd = open(PCSCLITE_RUN_PID, O_RDONLY);
if (fd >= 0)
{
char pid_ascii[PID_ASCII_SIZE];
(void)read(fd, pid_ascii, PID_ASCII_SIZE);
(void)close(fd);
pid = atoi(pid_ascii);
}
else
{
Log2(PCSC_LOG_CRITICAL, "Can't open " PCSCLITE_RUN_PID ": %s",
strerror(errno));
return -1;
}
return pid;
} /* GetDaemonPid */
int SendHotplugSignal(void)
{
pid_t pid;
pid = GetDaemonPid();
if (pid != -1)
{
Log2(PCSC_LOG_INFO, "Send hotplug signal to pcscd (pid=%d)", pid);
if (kill(pid, SIGUSR1) < 0)
{
Log3(PCSC_LOG_CRITICAL, "Can't signal pcscd (pid=%d): %s",
pid, strerror(errno));
return EXIT_FAILURE ;
}
(void)SYS_Sleep(1);
}
return EXIT_SUCCESS;
} /* SendHotplugSignal */
/**
* Check is OpenCT is running and display a critical message if it is
*
* The first cause of pcsc-lite failure is that OpenCT is installed and running
* and has already claimed the USB device. In that case RFAddReader() fails
* and I get a user support request
*/
#define OPENCT_FILE "/var/run/openct/status"
int CheckForOpenCT(void)
{
struct stat buf;
if (0 == stat(OPENCT_FILE, &buf))
{
Log1(PCSC_LOG_CRITICAL, "File " OPENCT_FILE " found. Remove OpenCT and try again");
return 1;
}
return 0;
} /* CheckForOpenCT */
/**
* return the difference (as long int) in µs between 2 struct timeval
* r = a - b
*/
long int time_sub(struct timeval *a, struct timeval *b)
{
struct timeval r;
r.tv_sec = a -> tv_sec - b -> tv_sec;
r.tv_usec = a -> tv_usec - b -> tv_usec;
if (r.tv_usec < 0)
{
r.tv_sec--;
r.tv_usec += 1000000;
}
return r.tv_sec * 1000000 + r.tv_usec;
} /* time_sub */
int ThreadCreate(pthread_t * pthThread, int attributes,
PCSCLITE_THREAD_FUNCTION(pvFunction), LPVOID pvArg)
{
pthread_attr_t attr;
int ret;
ret = pthread_attr_init(&attr);
if (ret)
return ret;
ret = pthread_attr_setdetachstate(&attr,
attributes & THREAD_ATTR_DETACHED ? PTHREAD_CREATE_DETACHED : PTHREAD_CREATE_JOINABLE);
if (ret)
{
(void)pthread_attr_destroy(&attr);
return ret;
}
ret = pthread_create(pthThread, &attr, pvFunction, pvArg);
if (ret)
return ret;
ret = pthread_attr_destroy(&attr);
return ret;
}