命令行解析与程序开启后台模式运行

一个命令行解析与程序开启后台模式运行的示例程序。

闲言少述，直接上代码：

/* Parse command parameters

*

* by Hank

* 2015/5/27

*/

#include <stdlib.h>

#include <string.h>

#include <math.h>

#include <stdio.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <time.h>

#include <signal.h> // to catch Ctrl-C

#include <getopt.h>

#include <sys/select.h>

#include <sys/types.h>

#include <unistd.h>

int

main(int argc, char **argv)

{

char const *short_options = "d:p:h:e:w:i:f:";

struct option const long_options[] = {

{ "daemon" , 0, NULL, 'd' },

{ "port" , 1, NULL, 'p' },

{ "key" , 1, NULL, 'i' },

{ "dir" , 1, NULL, 'e' },

{ "listen" , 1, NULL, 'w' },

{ "filename", 1, NULL, 'f' },

{ "help" , 0, NULL, 'h' },

{ NULL },

};

int daemon = 0;

char *filename = NULL, *dir = NULL;

int port = 0, listen=0;

int key=0;

for (;;)

{

int next_option = getopt_long(argc, argv, short_options, long_options, NULL);

if (next_option == -1)

break;

switch (next_option)

{

case 'd': daemon = 1; break;

case 'p': port = atoi(optarg); break;

case 'i': key = atoi(optarg); break;

case 'f': filename= optarg; break;

case 'e': dir = optarg; break;

case 'w': listen = atoi(optarg); break;

case 'h': printf("TEST [-d] [-h] <-p port> <-i key> <-w listen-port> [-e log-dir]\n"); break;

}

}

if (0 == port || NULL == filename || 0 == listen || 0 == key)

{

printf("TEST [-d] [-h]<-i key> <-p port> <-f file> <-w listen-port> [-e log-dir]\n");

goto MAINQUIT;

}

if (daemon)

{

pid_t pid = fork();

if (pid < 0)

return 0;

if (pid > 0) exit(0);

if (setsid() < 0)

{

printf ("%d \n",key);

goto MAINQUIT;

}

close(0);

close(1);

close(2);

open("/dev/null", O_RDONLY);

pid = getpid();

char buf[1024], str[1024];

struct tm tm;

time_t t = time(0);

localtime_r(&t, &tm );

strftime(str,1024,"%Y%m%d%H%M%S",&tm);

if (!dir)

dir = ".";

snprintf(buf, 1024, "%s/%d_%s_status.log", dir, pid, str);

open(buf, O_WRONLY|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);

snprintf(buf, 1024, "%s/%d_%s_trace.log", dir, pid, str);

open(buf, O_WRONLY|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);

}

MAINQUIT:

return 0;

}

编译命令行：

gcc -g -Wall -o test main.c

命令行：

./test -i 22 -e /opt -p 8080 -w 8088 -f ./test.conf -d