linuxÏÂÃæ¶¨Ê±
alarm
Èç¹û²»ÒªÇóºÜ¾«È·µÄ»°£¬Óà alarm() ºÍ signal() ¾Í¹»ÁË
unsigned int alarm(unsigned int seconds)
ʾÀý£º
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
void sigalrm_fn(int sig)
{
/* Do something */
printf("alarm!\n");
alarm(2);
return;
}
int main(void)
{
signal(SIGALRM, sigalrm_fn);
alarm(2);
/* Do someting */
while(1) pause();
}
2. setitimer
int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue));
3ÖÖÀàÐ͵Ķ¨Ê±Æ÷£º
ITIMER_REAL : ÒÔÏµÍ³ÕæÊµµÄʱ¼äÀ´¼ÆË㣬ËüËͳöSIGALRMÐźš£
ITIMER_VIRTUAL : ÒÔ¸ÃÐгÌÕæÕýÓÐÖ´ÐеÄʱ¼äÀ´¼ÆËã£
Ïà¹ØÎĵµ£º
£¨L2CAPÐÒé¼ò½é£¬L2CAPÔÚBlueZÖеÄʵÏÖÒÔ¼°L2CAP±à³Ì½Ó¿Ú£©
Ò»£ºL2CAPÐÒé¼ò½é£º
Logical Link Control and Adaptation Protocol(L2CAP)
Âß¼Á¬½Ó¿ØÖƺÍÊÊÅäÐÒé (L2CAP) ΪÉϲãÐÒéÌá¹©ÃæÏòÁ¬½ÓºÍÎÞÁ¬½ÓµÄÊý¾Ý·þÎñ£¬²¢Ìṩ¶àÐÒ鹦ÄܺͷָîÖØ×é²Ù×÷¡£L2CAP ³äÐíÉϲãÐÒéºÍÓ¦ÓÃÈí¼þ´«ÊäºÍ½ÓÊÕ×î´ó³¤¶ÈΪ 64K µÄ L2CAP Ê ......
ÀýÒ»£º·¢ËÍSignaling Packet£º
Signaling CommandÊÇ2¸öBluetoothʵÌåÖ®¼äµÄL2CAP²ãÃüÁî´«Êä¡£ËùÒÔµÃSignaling CommandʹÓÃCID 0x0001.
¶à¸öCommand¿ÉÒÔÔÚÒ»¸öC-frame£¨control frame£©Öз¢ËÍ¡£
Èç¹ûÒªÖ±½Ó·¢ËÍSignaling Command.ÐèÒª½¨Á¢SOCK_RAWÀàÐ͵ÄL2CAPÁ¬½ÓSocket¡£ÕâÑù²ÅÓлú»á×Ô¼ºÌî³äCommand Code£¬Identi ......
http://www.ibm.com/developerworks/cn/linux/l-rcu/
º¯ÊýÕªÒª£º
C´úÂë
/*¶ÁÕßÔÚ¶ÁÈ¡ÓÉRCU±£»¤µÄ¹²ÏíÊý¾ÝʱʹÓøú¯Êý±ê¼ÇËü½øÈë¶Á¶ËÁÙ½çÇø¡£*/
rcu_read_lock()
/*
¸Ãº¯ÊýÓërcu_read_lockÅä¶ÔʹÓã¬ÓÃÒÔ±ê¼Ç¶ÁÕßÍ˳ö¶Á¶ËÁÙ½çÇø¡£¼ÐÔÚÕâÁ½¸öº¯ÊýÖ®¼äµÄ´úÂëÇø³ÆÎª"¶Á¶ËÁÙ½çÇø" ......
ÎÊÌ⣺ÔÚLinuxÏÂÕý³£»»ÐеÄÎÄ×Ö£¬µ½ÁËWindowsϺ󣬲»ÔÙ»»ÐС£
ÔÚWindowsÏ»»ÐÐʱ£¬ÓÐÁ½¸ö×Ö·û£º»Ø³µ(\r)ºÍ»»ÐÐ(\n)¡£µ«ÔÚLinuxÏ£¬Ö»ÓÐÒ»¸ö»»ÐÐ(\n)
¿ÉʹÓÃunix2dosºÍdos2unixÃüÁî½øÐиñʽµÄת»»£º
²ÎÊý£º
-k ±£³ÖÊä³öÎļþºÍÊäÈëÎļþµÄÈÕÆÚʱ¼ä´Á²»±ä
-o file ĬÈÏģʽ . ½«fileת»»£ ......
¹¦ÄÜ˵Ã÷£º±È½ÏÎļþµÄ²îÒì¡£
Óï¡¡¡¡·¨£ºdiff [-abBcdefHilnNpPqrstTuvwy][-<ÐÐÊý>][-C <ÐÐÊý>][-D <¾Þ¼¯Ãû³Æ>][-I <×Ö·û»ò×Ö·û´®>][-S <Îļþ>][-W <¿í¶È>][-x <Îļþ»òĿ¼>][-X <Îļþ>][--help][--left-column][--suppress-common-line][Îļþ»òĿ¼1][Îļþ»òĿ¼2]
²¹³ä ......