Created
June 22, 2017 19:30
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haha4.c
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <signal.h> | |
#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <syslog.h> | |
static void start_skeleton_daemon() | |
{ | |
pid_t pid; | |
/* Fork off the parent process */ | |
pid = fork(); | |
/* An error occurred */ | |
if (pid < 0) | |
exit(EXIT_FAILURE); | |
/* Success: Let the parent terminate */ | |
if (pid > 0) | |
exit(EXIT_SUCCESS); | |
/* On success: The child process becomes session leader */ | |
if (setsid() < 0) | |
exit(EXIT_FAILURE); | |
/* Catch, ignore and handle signals */ | |
//TODO: Implement a working signal handler */ | |
signal(SIGCHLD, SIG_IGN); | |
signal(SIGHUP, SIG_IGN); | |
/* Fork off for the second time*/ | |
pid = fork(); | |
/* An error occurred */ | |
if (pid < 0) | |
exit(EXIT_FAILURE); | |
/* Success: Let the parent terminate */ | |
if (pid > 0) | |
exit(EXIT_SUCCESS); | |
/* Set new file permissions */ | |
umask(0); | |
/* Change the working directory to the root directory */ | |
/* or another appropriated directory */ | |
chdir("/"); | |
/* Close all open file descriptors */ | |
int x; | |
for (x = sysconf(_SC_OPEN_MAX); x>=0; x--) | |
{ | |
close (x); | |
} | |
/* Open the log file */ | |
openlog ("puzzle_daemon", LOG_PID, LOG_DAEMON); | |
} | |
// TODO: write real codes. :) | |
int daemon_main() | |
{ | |
while (1) | |
{ | |
syslog (LOG_NOTICE, "Puzzle daemon started."); | |
usleep(2*1000*1000); | |
} | |
return EXIT_SUCCESS; | |
} | |
int main() | |
{ | |
int ret; | |
start_skeleton_daemon(); | |
syslog (LOG_NOTICE, "Puzzle daemon started."); | |
ret = daemon_main(); | |
syslog (LOG_NOTICE, "Puzzle daemon terminated."); | |
closelog(); | |
return ret; | |
} | |
/////////////////////////////// | |
CC = arm-none-linux-gnueabi-gcc | |
OUT = puzzle_daemon | |
SRC = $(OUT).c | |
all: $(OUT) | |
$(OUT): $(SRC) | |
$(CC) -static $(SRC) -o $(OUT) | |
clear: | |
rm -rf $(OUT) |
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