ruby-list

きくたにです。

前にもちょっと書いたことがありますが、添付1のC programを
走らせて、子プロセスの添付2のrubyスクリプトが文字列"ruby"を
受け取らないのはなぜでしょう？

似たようなことをPythonでやると添付の3番目で動くのですけど。

-- 
人生を背負い投げ

菊谷 誠(Kikutani Makoto)  kikutani@eis.or.jp hgf03701@niftyserve.or.jp
                          http://www.eis.or.jp/muse/kikutani/

Attachments (2)

ipc-test0.c (1.36 KB, text/x-csrc)

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>

main()
{
   int pid, i, slen, l;
   char *cmd, *arg0, arg1[8], *str;
   int channel[2]; /* IPC channel with child process */
   char buf[10];

   if (socketpair(AF_UNIX, SOCK_STREAM, 0, channel) < 0) {
      fprintf(stderr, "socketpair failed\n");
      return;
   }

   if ((pid = vfork()) == -1) {
      return;
   }

   if (pid == 0) {		/* child process */
#if 0
      cmd = "./ipc0";
      arg0 = "ipc0";
#else
      cmd = "./ipc0.rb";
      arg0 = "ipc0.rb";
#endif
      sprintf(arg1, "%d", channel[0]);
      execl(cmd, arg0, arg1, NULL);
      perror("execl failed");
      close( channel[0] );
      _exit( 1 );
   }

   /* parent process */	
   close(channel[0]);


   i = 0x12345678;
   if ((l = write( channel[1], &i, sizeof(int))) != sizeof(int))
     printf("ipc-test0.c: int write failed. written length =  %d\n", l);

   if ((l = read( channel[1], buf, 2)) != 2)
     printf("ipc-test0.c: int read failed. read length =  %d\n", l);
   printf("buf = %s\n", buf);

   str = "ruby";
   slen = strlen(str);
   fflush(stdout);
   if ((l = write( channel[1], str, slen)) != slen)
     printf("ipc-test0.c: str write failed. written length =  %d\n", l);
   if ((l = read( channel[1], buf, 2)) != 2)
     printf("ipc-test0.c: int read failed. read length =  %d\n", l);
   printf("buf = %s\n", buf);

}

ipc0.py (443 Bytes, application/x-sh)

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[#5209] Please append me to ruby-ML — IWAMURO Motonori <iwa@...>

[#5210] みなさんはじめまして — "kozuka" <kozuka@...>

[#5214] 参加します — "MORIOKA,Toru" <vette@...>

[#5215] Join me. — "Motoyuki S." <moto@...>

[#5216] My first coding. — HAYASHI Daihachi <hayashi@...>

[#5218] base64.rb — HYOUDOU Kouichi /note <hyoudo@...>

[#5219] ruby for perl users — Noritsugu Nakamura <nnakamur@...>

[#5222] Re:ruby for perl users — yamakawa@...

[#5223] Re:ruby for perl users — yamakawa@...

[#5239] rbc-0_5.gz — toyofuku@...

[#5243] read from subprocess — Kikutani Makoto <kikutani@...>

[#5246] byte compile and ruby embeded system — Kikutani Makoto <kikutani@...>

[#5268] Re: ruby package for debian — Kikutani Makoto <kikutani@...>

[#5282] Re: rbc-0_5.gz — toyofuku@...

[#5283] None — "Koji Sago" <sago_koji@...>

[#5284] sub — "Motoyuki S." <moto@...>

[#5293] Re: rbc-0_5.gz — toyofuku@...

[#5294] binmode (Re: rbc-0_5.gz) — toyofuku@...

[#5300] Win32用の Rubyでの tkの使用 — Tomoaki Takebayashi <tota@...>

[#5304] Re^2: dbm & flock — 青山 和光 <PXN11625@...>

[#5306] Re^3: dbm & flock — 青山 和光 <PXN11625@...>

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[#5432] Re: curses module extconf.rb and Slackwa — 岡部 勝幸 <HGC02147@...>

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[#5444] Re: Mail to HTML — takagi@... (TAKAGI Hiromitsu)

[#5449] Re: curses module extconf.rb and Slackwa — 岡部 勝幸 <HGC02147@...>

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[ruby-list:5243] read from subprocess

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[#5304] Re^2: dbm & flock — 青山　和光 <PXN11625@...>

[#5306] Re^3: dbm & flock — 青山　和光 <PXN11625@...>

[#5432] Re: curses module extconf.rb and Slackwa — 岡部　勝幸 <HGC02147@...>

[#5449] Re: curses module extconf.rb and Slackwa — 岡部　勝幸 <HGC02147@...>