質問編集履歴
1
ソースコードの変更後の掲載
test
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File without changes
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test
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@@ -14,6 +14,46 @@
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######変更後
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moreコマンドが終了するようになりましたが，
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```terminal
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#ps -A | more
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11223 ? 00:00:00 kworker/4:3
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11224 ? 00:00:00 kworker/2:0
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11265 pts/9 00:00:00 ps
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11266 pts/9 00:00:00 more
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```
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```terminal
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#./a.out
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11392 ? 00:00:00 kworker/2:2
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11422 ? 00:00:00 kworker/3:0
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11454 pts/9 00:00:00 a.out
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11455 pts/9 00:00:00 ps
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46
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```
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となり，ps -A | more と全く同じ動きにはなりませんでした．
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### 該当のソースコード
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58
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@@ -146,6 +186,134 @@
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146
186
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```
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変更後
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```c
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define READ 0
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#define WRITE 1
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#define STD_in 0
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#define STD_out 1
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int main(int argc, char *argv[])
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{
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int fd[2];
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pid_t pid1, pid2;
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int status;
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if(pipe(fd) < 0){
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perror("pipe");
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exit(EXIT_FAILURE);
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}
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pid1 = fork();
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if (pid1 == 0)
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{
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dup2(fd[WRITE],STD_out);
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execlp("ps", "ps", "-A", NULL);
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}
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else if (pid1 > 0)
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{ //親
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wait(&status);
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close(fd[WRITE]);
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}
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else
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{
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perror("fork");
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exit(EXIT_FAILURE);
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}
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pid2 = fork();
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282
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if (pid2 == 0)
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284
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{
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286
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dup2(fd[READ],STD_in);
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288
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execlp("more", "more", NULL, NULL);
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}
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292
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293
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else if (pid1 > 0)
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{ //親
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wait(&status);
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298
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299
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}
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300
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301
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else
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302
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303
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{
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304
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305
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perror("fork");
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306
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307
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exit(EXIT_FAILURE);
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308
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309
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}
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310
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311
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312
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313
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}
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314
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+
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315
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+
```
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316
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+
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149
317
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150
318
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151
319
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### 試したこと
|