Linux daemon 프로그램 생성하기

참조

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소스코드

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>

int main(void) {

        /* Our process ID and Session ID */
        pid_t pid, sid;

        /* Fork off the parent process */
        pid = fork();
        if (pid < 0) {
                exit(EXIT_FAILURE);
        }
        /* If we got a good PID, then
           we can exit the parent process. */
        if (pid > 0) {
                exit(EXIT_SUCCESS);
        }

        /* Change the file mode mask */
        umask(0);

        /* Open any logs here */

        /* Create a new SID for the child process */
        sid = setsid();
        if (sid < 0) {
                /* Log the failure */
                exit(EXIT_FAILURE);
        }

        /* Change the current working directory */
        if ((chdir("/")) < 0) {
                /* Log the failure */
                exit(EXIT_FAILURE);
        }

        /* Close out the standard file descriptors */
        close(STDIN_FILENO);
        close(STDOUT_FILENO);
        close(STDERR_FILENO);

        /* Daemon-specific initialization goes here */

        /* The Big Loop */
        while (1) {
           /* Do some task here ... */

           sleep(30); /* wait 30 seconds */
        }
   exit(EXIT_SUCCESS);
}

Makefile

vi Makefile

AR=${CROSS_COMPILE}ar
AS=${CROSS_COMPILE}as
LD=${CROSS_COMPILE}ld
CC=$(CROSS_COMPILE)gcc
CXX=$(CROSS_COMPILE)g++
NM=${CROSS_COMPILE}nm
RANLIB=${CROSS_COMPILE}ranlib

CFLAGS=""
CPPFLAGS=""
LDFLAGS=""
LIBS=""

hello : main.cpp
        $(CXX) -g -o mydaemon main.cpp

clean:
        rm mydaemon

컴파일하기

make

./mydaemon

ps -efH
......
skyer9   1943290       1  0 17:43 ?        00:00:00   ./mydaemon

kill 1943290