この解答を考える際、日本語のRSSフィードにも対応できるようにした。

Python は、内部文字列に unicord文字列をつかっており、外部に渡すときは、バイト文字列に変換しなくてはならない。

searcher = re.compile(args[0].decode('utf-8'), re.IGNORECASE)

ここでは、args[0]を unicord文字列 に変換（decode）して、正規表現オブジェクトにしている。

さらに、この文字列を外部に渡すときは、バイト文字列に変換しなくてはならない。

txt = unicodedata.normalize('NFKC', txt).encode('utf-8', 'ignore')
print(txt)

使い方

$ make

で、コンパイルしたら、newshound ができるので

$ ./newshound '香港|hong kong|韓国|korea'

あるいは、Python2 で直に動作させたい場合は、

$ export RSS_FEED=https://news.yahoo.co.jp/pickup/rss.xml
 $ /usr/bin/python rssgossip.py [-u|p|h] '香港|hong kong|韓国|korea'

newshound.c

/*
 * newshound.c
 *
 * 参考
 * https://www.mkamimura.com/2014/09/c-unistdfork-idpid.html
 */

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

int main(int argc, char *argv[])
{

	char *feeds[] = {
        "https://news.yahoo.co.jp/pickup/rss.xml",
        "https://rss.msn.com/",
        "https://news.google.com/rss?ie=UTF-8&oe=UTF-8&topic=h&hl=en-US&gl=US&ceid=US:en"
    };
                   
    int times = 3;
    char *phrase = argv[1];
    int i;
    const char *PYTHON = "/usr/bin/python";
    const char *SCRIPT = "rssgossip.py";

    for (i = 0; i < times; i++) {
        char var[255];
        sprintf(var , "RSS_FEED=%s", feeds[i]);
        char *vars[] = {var, NULL};
        pid_t pid = fork();
        if (pid == -1) {
            fprintf(stderr, "プロセスをフォークできません:%s\n", strerror(errno));
            return (1);
        }
        if (!pid) {
            if (execle(PYTHON, PYTHON, SCRIPT, phrase, NULL, vars) == -1) {
                fprintf(stderr, "スクリプトを実行できません:%s\n", strerror(errno));
                return (1);
            }
        }
    }

    return (0);
}

Makefile

CC=cc
CFLAGS=-g -Wall
SRC=newshound.c
OBJ=newshound.o

all: newshound

newshound: $(OBJ)
	$(CC) $(CFLAGS) $(OBJ) -o newshound

newshound.o: newshound.c
	$(CC) $(CFLAGS) -c newshound.c -o newshound.o

clear:
	rm -rf newshound $(OBJ)

rssgossip.py

# Copyright (C) 2019 by Seiichi Nukayama
#
# This code works under Python2.
# 
# ---------- original copyright --------------------------------------------
# Copyright (C) 2011 by D+D Griffiths
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import urllib
import os
import re
import sys
import string
import unicodedata
import getopt
from xml.dom import minidom

def usage():
    print("Usage:\npython rssgossip.py [-uph] <search-regexp>")

try:
    opts, args = getopt.getopt(sys.argv[1:], "uph", ["urls", "prlist","help"])
except getopt.GetoptError, err:
    print str(err)
    usage()
    sys.exit(2)

include_urls = False
prlist = False
for o, a in opts:
    if o == "-u":
        include_urls = True
    elif o == "-p":
        prlist = True
    elif o in ("-h", "--help"):
        usage()
        sys.exit()
    else:
        assert False, "unhandled option"

# print(args[0])

searcher = re.compile(args[0].decode('utf-8'), re.IGNORECASE)
for url in string.split(os.environ['RSS_FEED']):
    print("url: %s" % url)
    feed = urllib.urlopen(url)
    try:
        dom = minidom.parse(feed)
        forecasts = []
        for node in dom.getElementsByTagName('title'):
            txt = node.firstChild.wholeText
            if prlist:
                prtxt = txt.encode('utf-8', 'ignore')
                print("> %s" % prtxt)
            if searcher.search(txt):
                txt = unicodedata.normalize('NFKC', txt).encode('utf-8', 'ignore')
                print(txt)
                if include_urls:
                    p = node.parentNode
                    link = p.getElementsByTagName('link')[0].firstChild.wholeText
                    print("\t%s" % link.encode('utf-8', 'ignore'))
    except:
        sys.exit(1)

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