Head First C ―頭とからだで覚えるCの基本
(オライリージャパン)
David Griffiths (著) Dawn Griffiths (著)
中田 秀基(監訳)(翻訳) 木下 哲也 (翻訳)
開発環境
- OS X Yosemite - Apple (OS)
- Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
- C (プログラミング言語)
- LLVM/Clang (コンパイラ, Xcode - Apple)
Head First C ―頭とからだで覚えるCの基本(David Griffiths (著)、Dawn Griffiths (著) 中田 秀基(監訳)(翻訳)、木下 哲也 (翻訳)、オライリージャパン)の10章(プロセス間通信: お話は楽しい)、自分で考えてみよう(p.435)を解いてみる。
その他参考書籍
- 21st Century C: C Tips from the New School
- プログラミング言語C 第2版 ANSI規格準拠(B.W. カーニハンD.M. リッチー(著)、石田 晴久(翻訳)、共立出版)
- プログラミング言語Cアンサー・ブック 第2版 (クロビス・L．トンド、スコット・E．ギンペル(著)、矢吹 道郎(翻訳))
- C実践プログラミング 第3版(Steve Oualline(著)、望月 康司 (監訳)(翻訳)、谷口 功(翻訳)、 オライリージャパン)
自分で考えてみよう(p.435)
コード(BBEdit, Emacs)
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stopif.h>
int main(int argc, char **argv) {
char *feeds[] = {"http://rss.cnn.com/rss/edition.rss",
"http://rss.cnn.com/rss/edition_world.rss",
"http://rss.cnn.com/rss/edition_africa.rss",
"http://rss.cnn.com/rss/edition_americas.rss",
"http://rss.cnn.com/rss/edition_asia.rss",
"http://rss.cnn.com/rss/edition_europe.rss",
"http://rss.cnn.com/rss/edition_meast.rss",
"http://rss.cnn.com/rss/edition_us.rss"};
FILE *out = fopen("stories.txt", "w");
Stopif(!out, return 1, "sotires.txtを開けません: %s", strerror(errno));
int times = 8;
char *phrase = argv[1];
for (int i = 0; i < times; i++) {
char *var;
asprintf(&var, "RSS_FEED=%s", feeds[i]);
char *vars[] = {var, NULL};
pid_t pid = fork();
Stopif(pid == -1, exit(1), "プロセスをフォークできません: %s",
strerror(errno));
Stopif(dup2(fileno(out), 1) == -1, exit(1),
"標準出力をリダイレクトできません: %s", strerror(errno));
if (!pid) {
Stopif(execle("/usr/bin/python", "/usr/bin/python", "rssgossip.py",
phrase, NULL, vars) == -1,
exit(1), "スクリプトを実行できません: %s", strerror(errno))
}
}
}
入出力結果(Terminal)
$ make newshound2 clang ... $ ./newshound2 US $ cat stories.txt U.S. missionary accused of aiding rebels Lord Vader's pact with Mickey Mouse Argentine President accused of bombing cover-up 15 must-try restaurants in 2015 Spain arrests 4 people suspected of recruiting for ISIS Thousands march for Putin UK jets intercept Russian aircraft LGBT group gets VIP status before pope Sebastien Ogier: Rally driver leaves rivals in the dust Old, rusty cars expected to sell for $20 million U.S. court: Palestinians 'must pay' for attacks Ousted Yemeni President wins support Jerusalem's mayor makes arrest Beyond Muscat: 10 reasons to visit Oman Obama's use of rhetoric in the fight vs. ISIS 30 Shiite Muslim men kidnapped Suspect in school massacre arrested Yellow dust blankets Seoul Australia to strengthen terror laws Abused maid: I can forgive my former employer 160 Boko Haram suspects arrested Is ISIS shifting its focus to Libya? Teacher turns $10 into booming business Tech genius transforms people's lives 2 suicide bombers hit bus depot $3M reward for Russian hacker Palestinians 'must pay' for attacks New Cosby accuser: 'Remember me?' Who wins battle between octopus and crab? Octopus leaps out of water, grabs crab Suicide bombers attack Nigeria bus station More than 20 women have come forward to accuse Cosby Cosby accusations eerily similar Who are Cosby's accusers? Suspect in Las Vegas shooting due in court The inside story of the famous Iwo Jima photo More than $28K raised for hero dog hurt in house fire Real estate agent lives in Witch's House 5 terror groups making vicious headlines Suspect in Pakistan school massacre arrested Octopus leaps out of water, nabs crab An unusual semisecret British trial Bus station bomb kills at least 13 Jerusalem's mayor arrests suspected attacker Teacher turns $10 into booming business Backstage at a traveling circus Spectacular ancient city deserted and mysterious 'It just went ballistic': Shark attacks teenager Is this the site of Jesus' trial? $
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