Sophie: howto-text-ja-9.0-1mdk noarch

howto-text-ja-9.0-1mdk.noarch.rpm

  The Linux Serial Programming HOWTO
  by Peter H. Baumann, Peter.Baumann@dlr.de
  v1.0, 22 January 1998
  ¡´PÃ, fujiwara@linux.or.jp
  26 February 1998

  ±Ì¶ÅÍCLinux }VÌVA|[gðgÁ½ÊMvOÌ«
  ûðà¾µÜ·D
  ______________________________________________________________________

  Ú

  1. Í¶ßÉ
     1.1 ì ÉÂ¢Ä
     1.2 {¶ÌÅVÅÌüèû@
     1.3 tB[hobN

  2. Í¶ßÄÝÜµå¤
     2.1 fobOÌû@
     2.2 |[gÌÝè
     2.3 VAfoCXÉ¨¯éüÍÌTO
        2.3.1 JmjJüÍ
        2.3.2 ñJmjJüÍ
        2.3.3 ñ¯úüÍ
        2.3.4 ¡üÍ©çÌüÍÒ¿

  3. vOá
     3.1 JmjJüÍ
     3.2 ñJmjJüÍ
     3.3 ñ¯úüÍ
     3.4 ¡ÌüÍ©çÌüÍÒ¿

  4. ¼Ìîñ¹
  5. Rgr[V

  ______________________________________________________________________

  1.  Í¶ßÉ

  {¶Í Linux Serial Programming HOWTO Å·DLinux ÌVA|[gð
  gÁÄC¼ÌfoCX/Rs[^ÆÊM·évOÌ«ûððàµ
  Ü·DJmjJ I/O(sPÊÅÌóM)Cñ¯ú I/OC¡\[X©çÌü
  ÍÒ¿ÌCÙÈé^CvÌè@ððàµÜ·D

  {¶ÅÍCVA|[gÌÝèû@Íà¾µÜ¹ñD±¿çÉÂ¢ÄÍC
  Greg Hankins Ì©ê½ Serial-HOWTO ð²¾³¢D

  ÍVAÊMÌªìÌêåÆÅÍ èÜ¹ñªCVAÊMÉÖíév
  WFNgÅâèððµÄ«Üµ½D{¶ÅÐî·éTvR[hÍC
  LDP vO}[YKCh
  (ftp://sunsite.unc.edu/pub/Linux/docs/LDP/programmers-
  guide/lpg-0.4.tar.gz yÑ~[TCg)Ì 'examples' fBNg©çü
  è·é±ÆªÅ«é miniterm ÉR·éàÌÅ·D

  1997NÌ6É±Ì¶ð¢Ä©çCÍÚqÌsÉæè WindowsNT ðg
  ¤æ¤ÉÈèCÖAm¯ð[ßé±ÆªÅ«Ü¹ñÅµ½D{¶É½f³¹
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  Æ)Ddðø«p¢Åæèæ¢àÌÉµÄ¾³éûª¢êÎC[Åm
  ç¹Ä¾³¢D

  SÄÌáèÌeXgÍCi386 x[XÌ Linux 2.0.29 Ås¢Üµ½D

  1.1.  ì ÉÂ¢Ä

  Linux Serial-Programming-HOWTOÍPeter Baumann Ìì¨Å·(copyright
  (C) 1997)DLinux HOWTO ¶ÍC±Ìì \¦ðüÏµÈ¢ÀèC¶Ì
  ê é¢ÍSÌðCCÓÌdqIE¨IfBAÖ¡»yÑzz·é±Æ
  ªÅ«Ü·D¤ÆIzzÍFßçêÄ¨èCÜ½½}µÄ¢Ü·Dµ©µC±
  Ìæ¤ÈzzÌêÉÍCÒÖÌAª é±Æðó]µÜ·D

  |óCh¶¨CLinux HOWTO ¶ðÜÞÒW¨Í±Ìì \¦É]íÈ¯ê
  ÎÈèÜ¹ñDÂÜèCHOWTO ©çh¶µ½¬Ê¨ðìèC±êÉ§ÀðÇÁ
  µÄzz·é±ÆÍÅ«Ü¹ñD½¾µCêèÌðÌºÅ±ÌK¥ÉáOð
  Fßé±ÆªÅ«éêª èÜ·DÈºÉAhXð¦· Linux HOWTO Ì
  ¢bðÉkµÄ¾³¢D

  ÈPÉ¾¦ÎCäXÍ±ÌîñðÅ«é¾¯½ÌoHÅLß½¢ÆvÁÄ¢
  Ü·Dµ©µCHOWTO ¶Ìì ÍÛ³êé±ÆÆCHOWTO ðÄzz·é
  SÄÌû@ðÅ«êÎmç¹Äàç¦é±Æðó]µÄ¢Ü·D

  ^â_ª êÎCLinux HOWTO Ì¢bðÅ é gregh@sunsite.unc.edu É
  dq[ÅkµÄ¾³¢D

  1.2.  {¶ÌÅVÅÌüèû@

  Serial-Programming-HOWTO ÌÅVÅÍ
  ftp://sunsite.unc.edu:/pub/Linux/docs/HOWTO/Serial-Programming-HOWTO
  yÑC»Ì~[TCgÅüèÅ«Ü·DPostScript â DVI Ì`®Ì¶
  Íother-formatsfBNgÉ èÜ·DÜ½C
  http://sunsite.unc.edu/LDP/HOWTO/Serial-Programming-HOWTO.html Éà 
  èÜ·µCÉêxcomp.os.linux.answersj[XO[vÉàe³êÜ
  ·D

  1.3.  tB[hobN

  ù³C¿âCRgCñÄCÇÁÈÇª êÎC¥ñMÒÉ¨mç¹
  ¾³¢D±Ì¶ðæèÇ¢àÌÉµ½¢ÆvÁÄ¢Ü·Dæª©çÈ¢Æ
  ±ëâCàÁÆª©èâ·Å«éªðmç¹Ä¾³¢DMÒÉA·é
  ÉÍPeter.Baumann@dlr.deÖdq[ðoµÄ¾³¢Ddq[ð
  ÛÉÍCÇñ¾ Serial-Programming-HOWTO Ìo[W(±Ì¶Ío[
  W1.0Å·)à¢Ä¾³¢D

  ó: ú{êóÌÅVÅÍJF vWFNgz[y[W ÅüèÅ«Ü·DÜ
  ½Cëóª êÎóÒÌûÖ[ðoµÄ¾³¢D

  2.  Í¶ßÄÝÜµå¤

  2.1.  fobOÌû@

   È½ª¢½R[hðfobO·é½ßÌÅàÇ¢û@ÍCLinux }Vð
  à¤êäpÓµCñäÌRs[^ðkfP[uÅÚ±·é±ÆÅ
  ·Dminiterm(LDP vO}[YKCh
  (ftp://sunsite.unc.edu/pub/Linux/docs/LDP/programmers-
  guide/lpg-0.4.tar.gz Ì'examples'fBNgÉ èÜ·)ðgÁÄC È
  ½Ì Linux }VÖ¶ðÁÄÝÜµå¤Dminiterm ÍñíÉÈPÉR
  pCÅ«CL[{[hüÍðVA|[goRÅ»ÌÜÜ(raw)èÜ
  ·D½¾Cdefine ¶ #define MODEMDEVICE "/dev/ttyS0"Ìª¾¯Í`Fb
  NµÈÄÍÈèÜ¹ñD±ÌªÍCP[uÅÚ±·éÌª COM1 Å ê
  Î ttyS0CCOM2Å êÎttyS1Ìæ¤ÉÝèµÜ·D±ÌeXgÅåÈ_
  ÍCSÄÌ¶Í»ÌÜÜ(raw, oÍ³µÉ)M³êé±ÆÅ·DÚ±
  eXgð·éÆ«ÍC¼ûÌ}VÅ miniterm ðÀsµCL[{[hð@
  ¾¯Å·DÐûÌ}VÅüÍ³ê½¶ÍCà¤êûÌ}VÅoÍ³êÜ
  ·D»Ìtà¯¶Å·DüÍµ½¶ÍCüÍµ½ûÌ}VÌæÊÉÍGR
  [³êÜ¹ñD

  kfP[uð©ì·éÉÍCTxD(M)ÆRxD(óM)ÌüðNX³
  ¹Ü·DP[uÉÂ¢ÄÌÚµ¢ðàÍCSerial-HOWTO Ìæ7ÍÉ èÜ
  ·D

  ¢gpÌVA|[gª2Â éÌÈçÎCêäÌRs[^Å±ÌeX
  gðÀs·é±ÆàÅ«Ü·D±ÌêÍC2ÂÌ¼zR\[Å»ê¼ê
  miniterm ðÀsµÜ·DVA}EXðOµÄVA|[gðó¯éê
  ÉÍC/dev/mouseð·¦é±ÆðYêÈ¢æ¤ÉµÜµå¤D}`|[
  gVAJ[hðgÁÄ¢éêÉÍCÝèª³µ¢±ÆðmFµÜµå
  ¤DMÒÍ©ªÌ}VÅÔáÁ½ÝèðµÄ¢½½ßÉC©ªÌ}VÅe
  Xgµ½¾¯¤Ü®ì·éÆ¢¤ÔÉÈÁ½±Æª èÜ·D±ÌÝè
  Å¼ÌRs[^ÉÚ±µ½ÉÍC¶ªÁ¦ÄµÜ¢Üµ½D 2ÂÌv
  Oð1ÂÌRs[^Å®©·±ÆÍC®SÉñ¯úÆÍ¾¦Ü¹
  ñD

  n

  2.2.  |[gÌÝè

  /dev/ttyS*Æ¢¤foCXÍ[ð Linux }VÉq®½ßÌàÌÅCÊM
  ðnß½ãÍ[Éí¹½ÝèªsíêÜ·D±Ì_Í raw foCXð
  gÁÄÊM·évOðs¤êÉÍCÓµÄ¨©È¯êÎÈèÜñD
  á¦ÎCÁ½LN^ðGR[obN³¹éæ¤ÉVA|[gðÝè
  ³êÄ¢Ü·ªCÊíf[^MÌ½ßÉÍ±ÌÝèÍÏXµÈ¯êÎ¢¯Ü
  ¹ñD

  SÄÌp[^ÍvOàÅÈPÉÝèÅ«Ü·DÝèÍwb_t@C
  <asm/termbits.h>Åè`³êÄ¢é termios \¢ÌÉÛ¶³êÜ·D

       #define NCCS 19
       struct termios {
               tcflag_t c_iflag;               /* input mode flags */
               tcflag_t c_oflag;               /* output mode flags */
               tcflag_t c_cflag;               /* control mode flags */
               tcflag_t c_lflag;               /* local mode flags */
               cc_t c_line;                    /* line discipline */
               cc_t c_cc[NCCS];                /* control characters */
       };

  ±Ì<asm/termbits.h> t@CÉÍCtOÌè`àSÄLq³êÄ¢Ü
  ·Dc_iflag tOÉÍüÍ[hÌtOª¢Â©ÜÜêÄ¨èCSÄÌ
  üÍðwèµÜ·DüÍÆÍCfoCX©ççê½LN^
  ÍCreadÅÇÝo³êéOÉ·é±ÆªÅ«éÆ¢¤±ÆÅ·D¯l
  ÉCc_oflagÍoÍðµ¢Ü·D c_cflagÍC{[[gâ¶Ìrb
  gCXgbvrbgÈÇÌ|[gÝèðL^µÄ¢Ü·Dc_lflag àÌ[
  J[htOÍC¶ªGR[³êé©Ç¤©CvOÉVOiª
  çêé©Ç¤©ðwèµÜ·DÅãÉCzñ c_cc ÅÍCt@CI
  [Cstop Ì§ä¶ðè`µÜ·D§ä¶ÌftHglÍ
  <asm/termios.h> Åè`³êÄ¢Ü·DetOÉÂ¢ÄÍCIC}
  jAÌ termios(3) Éà¾ª èÜ·D\¢Ì termiosÍ POSIX Ì
  VXeÅÍp¢çêÈ¢C c_linevfðÜñÅ¢Ü·D

  2.3.  VAfoCXÉ¨¯éüÍÌTO

  ±±ÅÍC3ÂÌÙÈéíÞÌüÍÌTOðà¾µÜ·DpÚIÉ]ÁÄC
  KØÈàÌðIðµÄ¾³¢D¶ñSÌðæ¾·éÌÉC1¶ÇÝÝ
  Ì[vðg¤±ÆÍÅ«éÀèð¯é×«Å·DÍ±êðâÁ½Æ«CÇ
  ÝÝÉ read ªSG[ðoÍµÈ©Á½ÌÉà©©íç¸C¶ª
  ¯ÄµÜÁ½±Æª èÜµ½D

  2.3.1.  JmjJüÍ

  ±êÍ[ÉÎµÄÌÊíÌ[hÅ·ªC¼ÌfoCXÆÌÊMÌÉ
  àÖÅ·DSÄÌüÍÍsPÊÅ³êÜ·DÂÜèCread ÍüÍÌ1s
  SÌÌÝðÔµÄ«Ü·DftHgÅÍCsÍNL(ASCII ÌLF)Ct@CI
  [CsI[¶Ì¢¸ê©ÅIèÜ·DWÌÝèÅÍCCR (DOS/Windows Ì
  ftHgÌsI[¶)ÍsÌI[ÆÍÈèÜ¹ñD

  JmjJüÍÅÍCÁ(erase)CPêÌí(delete word)C¶ÌÄ
  oÍ(reprint characters)CCRÌNLÖÌÏ·ÈÇðµ¤±ÆªÅ«Ü·D

  2.3.2.  ñJmjJüÍ

  ñJmjJüÍÍCread ÉÜÁ½Ì¶ðµ¤û@ÅCL
  N^^C}ðp·é±ÆàÅ«Ü·D±Ì[hÍAvP[Vª
  ÜÁ½¶ÌLN^ðÇÝÞâCÚ±µ½foCXªåÊÌ¶ð
  ÁÄéêÉgpµÜ·D

  2.3.3.  ñ¯úüÍ

  ãL2ÂÌ[hÍC¯úyÑñ¯ú[hÅg¤±ÆªÅ«Ü·DftH
  gÍCüÍª¤Ü¢ÜÅ read ¶ªubN³êé¯ú[hÅ·Dñ¯
  ú[hÅÍCread ¶Í¦ÀÉI¹µCãÅÇÝÝª®¹µ½ÉvO
  ÉVOiªçêÜ·D±ÌVOiÍCVOinhðgÁÄó
  ¯æèÜ·D

  2.3.4.  ¡üÍ©çÌüÍÒ¿

  ±êÍÊÌüÍ[hÆ¢¤í¯ÅÍ èÜ¹ñªC¡ÌfoCXðµ¤
  ÉÖÅ·DMÒÌAvP[VÅÍCTCP/IP \PbgoRÌüÍÆ¼
  ÌRs[^©çÌVAÚ±oRÌüÍð[IÉ¯ÉµÁÄ¢Ü
  ·DÈºÉ¦·vOáÅÍCÙÈé2ÂÌüÍ\[X©çÌüÍÒ¿ð
  s¢Ü·DÐûÌ\[X©çÌüÍªÂ\ÉÈéÆC»ÌüÍª³êCv
  OÍÌüÍðÒ¿Ü·D

  ÈºÉ¦·Av[`Í¿åÁÆ¡GÉ©¦Ü·ªCLinux Í}`vZb
  VO OS Å é±ÆðYêÄÍ¢¯Ü¹ñDselectVXeR[ÍüÍÒ
  ¿ÌÔÍ CPU É×ð^¦Ü¹ñªC[vðgÁ½üÍÒ¿ðs¤ÆC¯
  ÉÀs³êÄ¢é¼ÌvZXªxÈÁÄµÜ¢Ü·D

  3.  vOá

  SÄÌáÍ miniterm.c ©çæèoµ½àÌÅ·DæsüÍÌobt@Í 255
  ¶É§À³êÄ¢Ü·D±êÍCJmjJüÍÌÅå¶·Æ¯¶Å
  · (<linux/limits.h>  é¢Í <posix1_lim.h>ðQÆ)D

  »ê¼êÌüÍ[hÌg¢ûÉÂ¢ÄÍvOÌRgð©Ä¾
  ³¢DvOÍ\ªÇÝ±È¹éÆv¢Ü·DJmjJüÍ[hÌá
  ÉÍêÔÚµ¢Rgðt¯Ä¢Ü·Dá¢ð²·é½ßÉC¼ÌáÉÂ
  ¢ÄÍJmjJüÍ[hÆÌá_¾¯ð¢Ä¢Ü·D

  à¾Í®SÅÍ èÜ¹ñªCECðoµÄáèÅÀ±µC È½ÌÚIÉÅ
  àKµ½ðð©Â¯¾µÄ¾³¢D

  gp·éVA|[gÉÍCKØÈp[~bVð^¦éÌðYêÈ¢Å
  ¾³¢(á: chmod a+rw /dev/ttyS1)D

  3.1.  JmjJüÍ

  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <termios.h>
  #include <stdio.h>

  /* <asm/termbits.h> Åè`³êÄ¢é{[[gÌÝèD±êÍ
  <termios.h>©çCN[h³êéD */
  #define BAUDRATE B38400
  /* KØÈVA|[gðw·æ¤ÉC±Ìè`ðÏX·éD*/
  #define MODEMDEVICE "/dev/ttyS1"
  #define _POSIX_SOURCE 1  /* POSIX Ì\[X */

  #define FALSE 0
  #define TRUE 1

  volatile int STOP=FALSE;

  main()
  {
    int fd,c, res;
    struct termios oldtio,newtio;
    char buf[255];
  /*
    ÇÝ«Ì½ßÉffoCXðI[v·éDmCYÉæÁÄ CTRL-C
    ª½Ü½Ü¶µÄàÚ±ªØêÈ¢æ¤ÉCtty §äÍµÈ¢D
  */

  fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY );
   if (fd <0) {perror(MODEMDEVICE); exit(-1); }

   tcgetattr(fd,&oldtio); /* »ÝÌVA|[gÌÝèðÒð³¹é*/
   bzero(&newtio, sizeof(newtio)); /* Vµ¢|[gÌÝèÌ\¢ÌðNA·é */

  /*
    BAUDRATE: {[[gÌÝèDcfsetispeed Æ cfsetospeed àgpÅ«éD
    CRTSCTS : oÍÌn[hEFAt[§ä (KvÈüªSÄ³êÄ¢éP[
              uðg¤êÌÝDSerial-HOWTO Ì7ÍðQÆÌ±Æ)
    CS8     : 8n1 (8 rbgCmpeBCXgbvrbg 1)
    CLOCAL  : [JÚ±Cf§äÈµ
    CREAD   : óM¶(receiving characters)ðLøÉ·éD
  */
   newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;

  /*
    IGNPAR  : peBG[Ìf[^Í³·é
    ICRNL   : CR ð NL ÉÎ³¹é(±êðsíÈ¢ÆC¼ÌRs[^Å
              CR ðüÍµÄàCüÍªIèÉÈçÈ¢)
    »êÈOÌÝèÅÍCfoCXÍ raw [hÅ é(¼ÌüÍÍsíÈ¢)
  */
   newtio.c_iflag = IGNPAR | ICRNL;

  /*
   Raw [hÅÌoÍ
  */
   newtio.c_oflag = 0;

  /*
    ICANON  : JmjJüÍðLøÉ·é
    SÄÌGR[ð³øÉµCvOÉÎµÄVOiÍç¹È¢
  */
   newtio.c_lflag = ICANON;

  /*
    SÄÌ§ä¶ðú»·é
    ftHglÍ /usr/include/termios.h ð©êÎª©éªCRgÉ
    ¢Ä éÌÅC±±ÅÍ©éKvÍÈ¢D
  */
   newtio.c_cc[VINTR]    = 0;     /* Ctrl-c */
   newtio.c_cc[VQUIT]    = 0;     /* Ctrl-\ */
   newtio.c_cc[VERASE]   = 0;     /* del */
   newtio.c_cc[VKILL]    = 0;     /* @ */
   newtio.c_cc[VEOF]     = 4;     /* Ctrl-d */
   newtio.c_cc[VTIME]    = 0;     /* LN^Ô^C}ðgíÈ¢ */
   newtio.c_cc[VMIN]     = 1;     /* 1¶éÜÅCÇÝÝðubN·é */
   newtio.c_cc[VSWTC]    = 0;     /* '\0' */
   newtio.c_cc[VSTART]   = 0;     /* Ctrl-q */
   newtio.c_cc[VSTOP]    = 0;     /* Ctrl-s */
   newtio.c_cc[VSUSP]    = 0;     /* Ctrl-z */
   newtio.c_cc[VEOL]     = 0;     /* '\0' */
   newtio.c_cc[VREPRINT] = 0;     /* Ctrl-r */
   newtio.c_cc[VDISCARD] = 0;     /* Ctrl-u */
   newtio.c_cc[VWERASE]  = 0;     /* Ctrl-w */
   newtio.c_cc[VLNEXT]   = 0;     /* Ctrl-v */
   newtio.c_cc[VEOL2]    = 0;     /* '\0' */

  /*
    fCðNAµC|[gÌÝèðLøÉ·é
  */
   tcflush(fd, TCIFLUSH);
   tcsetattr(fd,TCSANOW,&newtio);

  /*
    [ÌÝèI¹DüÍð·éÅ«éæ¤ÉÈÁ½D
    áÅÍCsÌæªÉ 'z' ðüÍ·é±ÆÅvOðI¹³¹é
  */
   while (STOP==FALSE) {     /* I¹ðª½³êéÜÅ[v */
  /*
      255¶ÈãüÍ³ê½êÅàCsI[¶ªüÍ³êéÜÅÍCv
      OÌÀsÍ read ÅubN³êéDÇÝñ¾¶ªCÀÛÉü
      Í³êÄ¢é¶æèÈ¢êÉÍCñÌ read ÅcèÌ¶ªÇ
      ÝÜêéDÏ res ÉÍÀÛÉÇÝÜê½¶ªZbg³êéD
  */
      res = read(fd,buf,255);
      buf[res]=0;             /* printf Åg¤½ßC¶ñÌI[ðZbg·é */
      printf(":%s:%d\n", buf, res);
      if (buf[0]=='z') STOP=TRUE;
   }
   /* |[gÌÝèðvOJnÌàÌÉß· */
   tcsetattr(fd,TCSANOW,&oldtio);
  }

  3.2.  ñJmjJüÍ

  ñJmjJüÍ[hÅÍCüÍðsÆµÄÜÆßé±ÆÍsíê¸C
  üÍ(erase, kill, delete )àsíêÜ¹ñD±Ì[hÌ§äÍ2Â
  Ìp[^Ås¢Ü·D c_cc[VTIME]ÅLN^^C}ÌÝèðs¢C
  c_cc[VMIN]ÅÍÇÝÝð«·éOÉó¯æéÅ¬Ì¶ðÝèµÜ·D

  MIN > 0 Å TIME = 0 ÌêCMIN ÅÇÝÝª«·éOÉó¯æé¶
  ðÝèµÜ·DTIME Í[ÈÌÅC^C}ÍgíêÜ¹ñD

  MIN = 0 Å TIME > 0 ÌêÉÍCTIME Í^CAEglÉÈèÜ·DÇÝ
  ÝÍ1¶ÇÝÜê½ê©CÔ TIME (Ò¿Ô = TIME * 0.1 b) ð
  ß¬½êÉ«³êÜ·DÔðz¦½êÉÍC¶ÍÔ³êÜ¹ñD
  MIN > 0 Å TIME > 0 ÌêÉÍCTIME ÍLN^Ô^C}ÌÝèÉÈè
  Ü·DÇÝÝÍ MIN ¶ó¯æÁ½ê©C2ÂÌ¶ðó¯æéÔÌÔ
  ª TIME ðz¦½êÉ«³êÜ·D^C}Í1¶ó¯æé²ÆÉú»
  ³êÜ·DÜ½CÅÌ1¶ðó¯æéÜÅÍ^C}ÍLøÉÍÈèÜ¹
  ñD

  MIN = 0 ©Â TIME = 0 ÌêÉÍCÇÝÝÍ¦ÀÉ«³êÜ·D»ÝÇ
  ÝÝÂ\È¶©Cvµ½¶ªß³êÜ·DAntonio ³ñÉæêÎ
  (contributions QÆ)CÇÝÝÌOÉ fcntl(fd, F_SETFL,FNDELAY); ðÀ
  s·é±ÆÅC¯¶Êð¾é±ÆªÅ«Ü·D

  newtio.c_cc[VTIME] Æ newtio.c_cc[VMIN] ðÏX·é±ÆÅCÈãÌ[h
  ðSÄ·±ÆªÅ«Ü·D

  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <termios.h>
  #include <stdio.h>

  #define BAUDRATE B38400
  #define MODEMDEVICE "/dev/ttyS1"
  #define _POSIX_SOURCE 1 /* POSIX Ì\[X */
  #define FALSE 0
  #define TRUE 1

  volatile int STOP=FALSE;

  main()
  {
    int fd,c, res;
    struct termios oldtio,newtio;
    char buf[255];

   fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY );
   if (fd <0) {perror(MODEMDEVICE); exit(-1); }

   tcgetattr(fd,&oldtio); /* »ÝÌ|[gÝèðÒð */

   bzero(&newtio, sizeof(newtio));
   newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
   newtio.c_iflag = IGNPAR;
   newtio.c_oflag = 0;

   /* set input mode (non-canonical, no echo,...) */
   newtio.c_lflag = 0;

   newtio.c_cc[VTIME]    = 0;   /* LN^Ô^C}Í¢gp */
   newtio.c_cc[VMIN]     = 5;   /* 5¶ó¯æéÜÅubN·é */

   tcflush(fd, TCIFLUSH);
   tcsetattr(fd,TCSANOW,&newtio);

   while (STOP==FALSE) {       /* üÍ[v */
     res = read(fd,buf,255);   /* 5 ¶üÍ³ê½çßé */
     buf[res]=0;               /* printf ðg¤½ßÉ¶ñI[ðZbg */
     printf(":%s:%d\n", buf, res);
     if (buf[0]=='z') STOP=TRUE;
   }
   tcsetattr(fd,TCSANOW,&oldtio);
  }

  3.3.  ñ¯úüÍ

  #include <termios.h>
  #include <stdio.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <sys/signal.h>
  #include <sys/types.h>

  #define BAUDRATE B38400
  #define MODEMDEVICE "/dev/ttyS1"
  #define _POSIX_SOURCE 1 /* POSIX Ì\[X */
  #define FALSE 0
  #define TRUE 1

  volatile int STOP=FALSE;

  void signal_handler_IO (int status);   /* VOinhÌé¾ */
  int wait_flag=TRUE;                    /* VOiðó¯æÁÄ¢È¯êÎ TRUE */

  main()
  {
    int fd,c, res;
    struct termios oldtio,newtio;
    struct sigaction saio;           /* VOiðó¯½Ì®ìðè` */
    char buf[255];

    /* foCXðñubLO[hÅI[v·é
       (read Í¦ÀÉßÁÄéæ¤ÉÈé) */
    fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY | O_NONBLOCK);
    if (fd <0) {perror(MODEMDEVICE); exit(-1); }

    /* foCXðñ¯ú[hÉ·éOÉCVOinhðÝè·é */
    saio.sa_handler = signal_handler_IO;
    saio.sa_mask = 0;
    saio.sa_flags = 0;
    saio.sa_restorer = NULL;
    sigaction(SIGIO,&saio,NULL);

    /* vZXª SIGIO ðó¯æêéæ¤É·é */
    fcntl(fd, F_SETOWN, getpid());
    /* t@CfXNv^ðñ¯ú[hÉ·é (IC}jAÉ
       æêÎCO_APPEND Æ O_NONBLOCK ¾¯ª F_SETFL Å®ì·éÆÌ±Æc
     */
    fcntl(fd, F_SETFL, FASYNC);

    tcgetattr(fd,&oldtio); /* save current port settings */
    /* Vµ¢|[gÌÝèðJmjJüÍÉÝè·é */
    newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;
    newtio.c_iflag = IGNPAR | ICRNL;
    newtio.c_oflag = 0;
    newtio.c_lflag = ICANON;
    newtio.c_cc[VMIN]=1;
    newtio.c_cc[VTIME]=0;
    tcflush(fd, TCIFLUSH);
    tcsetattr(fd,TCSANOW,&newtio);

    /* üÍÒ¿ÌÔ[vµÜ·DÊíÍ±±Å½ç©ÌìÆð·é */
    while (STOP==FALSE) {
      printf(".\n");usleep(100000);
      /* SIGIO ðó¯æèCwait_flag = FALSE ÉÈÁÄ¢êÎüÍªpÂ
         \ÈÌÅÇÝÝðs¤±ÆªÅ«é */
      if (wait_flag==FALSE) {
        res = read(fd,buf,255);
        buf[res]=0;
        printf(":%s:%d\n", buf, res);
        if (res==1) STOP=TRUE; /* CR ¾¯ªüÍ³ê½êÉ[vI¹ */
        wait_flag = TRUE;      /* ÌüÍðÒÂ */
      }
    }
    /* vOJnÌ|[gÝèð³·é */
    tcsetattr(fd,TCSANOW,&oldtio);
  }

  /**********************************************************************
  * VOinhDãLÌ[vÅ¶ðó¯æÁ½±Æð¦·½ßÉC  *
  * wait_flag É FALSE ðZbg·éD                                   *
  ***********************************************************************/

  void signal_handler_IO (int status)
  {
    printf("received SIGIO signal.\n");
    wait_flag = FALSE;
  }

  3.4.  ¡ÌüÍ©çÌüÍÒ¿

  ±ÌÍÍÈPÉÏÜ¹Ü·Dqgð¦·±ÆªÚIÈÌÅCTvÌv
  OàZ¢àÌÉµÄ¢Ü·D±ÌdgÍVA|[g¾¯ÅÈCSÄ
  Ìt@CfXNv^ÌWÉÎµÄg¤±ÆªÅ«Ü·D

  select VXeR[Æ±êÉº¤}NÅÍCfd_set ðg¢Ü·D±ê
  ÍCSÄÌLøÈt@CfXNv^ÌGg[ªÜÜêérbgñÅ
  ·Dselect Ít@CfXNv^ÉÎ·érbgW fd_setðøÆ
  µCfd_setÉüoÍªÂ\Èt@CfXNv^C é¢ÍáOª¶µ½
  t@CfXNv^ÌWðZbgµÜ·Dfd_set ÌìÍpÓ³êÄ¢
  é}NÅs¢Ü·DÚµÍIC}jAÌ select(2) ðQÆµ
  Ä¾³¢D

  #include <sys/time.h>
  #include <sys/types.h>
  #include <unistd.h>

  main()
  {
     int    fd1, fd2;  /* üÍ\[X 1, 2 */
     fd_set readfs;    /* t@CfXNv^ÌW */
     int    maxfd;     /* gíêÄ¢ét@CfXNv^ÌÅål */
     int    loop=1;    /* [vµÄ¢éÔÍ TRUE */

     /* open_input_source ÅÍfoCXÌI[vC³µ¢|[gÌÝèªsí
        êCt@CfXNv^ªßµlÉÈÁÄ¢éàÌÆ·éD */
     fd1 = open_input_source("/dev/ttyS1");   /* COM2 */
     if (fd1 <0) exit(0);
     fd2 = open_input_source("/dev/ttyS2");   /* COM3 */
     if (fd2 <0) exit(0);
     maxfd = MAX (fd1, fd2)+1;  /* ²×érbg·ÌÅål */

     /* üÍÌ½ßÌ[v */
     while (loop) {
       FD_SET(fd1, &readfs);  /* \[X 1 ð²×é±Æðwè */
       FD_SET(fd2, &readfs);  /* \[X 2 ð²×é±Æðwè */
       /* block until input becomes available */
       select(maxfd, &readfs, NULL, NULL, NULL);
       if (FD_ISSET(fd1))         /* \[X 1 ©çÌüÍªÂ\ */
         handle_input_from_source1();
       if (FD_ISSET(fd2))         /* \[X 2 ©çÌüÍªÂ\ */
         handle_input_from_source2();
     }

  }

  ±ÌáÅÍCÇ¿ç©Ì\[X©çüÍªsíêéÜÅCvOª¢ÂÜ
  ÅàubN³êÄµÜ¢Ü·DüÍÌ^CAEgðwèµ½¢êÉÍC
  select VXeR[ÌªðÌæ¤É«·¦Ü·D

       int res;
       struct timeval Timeout;

       /* üÍ[vÅÌ^CAEglðÝè */
       Timeout.tv_usec = 0;  /* ~b */
       Timeout.tv_sec  = 1;  /* b */
       res = select(maxfd, &readfs, NULL, NULL, &Timeout);
       if (res==0)
       /* üÍª Á½t@CfXNv^Ìª 0 ÈçÎC^CAEg¶ */

  ±ÌáÅÍ 1 bãÉ^CAEgÉÈèÜ·D^CAEgÆÈÁ½êÉ
  ÍCselect Í 0 ðÔµÜ·ªCTimeout Í selectªÀÛÉüÍðÒÁ½
  ÔÌª¾¯¸ç³êé±ÆÉÓµÄ¾³¢D^CAEglª[Ìê
  ÉÍCselect Í¦ÀÉAÁÄ«Ü·D

  4.  ¼Ìîñ¹

  o  Linux Serial-HOWTO ÉÍVA|[gÌÝèû@ÆCn[hEFAÌî
     ñª©êÄ¢Ü·D

  o  Serial Programming Guide for POSIX Compliant Operating Systems
     <http://www.easysw.com/~mike/serial>DMichael Sweet ³ñÌy[WÅ
     ·D±ÌNÍ½ÇêÈÈÁÄµÜÁ½ÌÅ·ªCVµ¢ URL ªí©
     èÜ¹ñDÇÈ½©³¦Ä¾³¢DÇÅ«½¶¾Á½ÌÉI

  o  IC}jAÌtermios(3)ÉÍCtermios \¢ÌÌSÄÌtO
     Ìà¾ª èÜ·D

  5.  Rgr[V

  ÅÉq×½æ¤ÉCMÒÍ±ÌªìÌGLXp[gÅÍ èÜ¹ñDµ©
  µC©ª©gÅâèÉ¼ÊµC¼ÌlÌ¯ðØèÈªçâèððµÜµ
  ½D European Transonic Windtunnel, Cologne Ì Strudthoff C Michael
  Carter  (mcarter@rocke.electro.swri.eduCPeter Waltenberg 
  (p.waltenberg@karaka.chch.cri.nz)ÌFlÉ´ÓµÜ·D

  Antonino Ianella (antonino@usa.netÍCMÒª±Ì¶ðõµÄ¢éÌ
  ÆÙÚ¯É Serial-Port-Programming Mini HOWTO ðì¬µÜµ½DGreg
  Hankins ÌñÄÉæèCAntonino Ì Mini-HOWTO ð{¶ÆµÜµ
  ½D

  ±Ì¶Ì\¢Æ SGML Éæé®`ÍCGreg Hankins Ì Serial-HOWTO ð
  îÉµÄ¢Ü·D{¶ÉC³ðüêÄê½ Dave Pfaltzgraff
  (Dave_Pfaltzgraff@patapsco.com)C Sean Lincolne
  (slincol@tpgi.com.au)C Michael Wiedmann  (mw@miwie.in-
  berlin.de)C Adrey Bonar (andy@tipas.lt) ÌF³ñÉ´ÓµÜ·D