Liderahenk/go-daemon
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c-daemon not linked to tty

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Aliberk Sandıkçı 2023-07-26 15:29:40 +03:00
parent 7198d71d38
commit c9c795fe4e
Signed by: asandikci
GPG key ID: 25C67A03B5666BC1
3 changed files with 38 additions and 8 deletions
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2
.gitignore vendored
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@ -77,4 +77,4 @@ Mkfile.old
dkms.conf dkms.conf
### USER MODIFIED ### ### USER MODIFIED ###
# c-daemon/bin/ c-daemon/bin/

1
README.md
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@ -15,6 +15,7 @@ git clone https://git.aliberksandikci.com.tr/liderahenk/go-daemon
cd go-daemon/ cd go-daemon/
go build -o c-daemon/bin/ c-daemon/go-files/info.go go build -o c-daemon/bin/ c-daemon/go-files/info.go
gcc -o c-daemon/bin/test c-daemon/daemon/test.c c-daemon/daemon/daemon.c gcc -o c-daemon/bin/test c-daemon/daemon/test.c c-daemon/daemon/daemon.c
sudo ln -sv "$(pwd)"/c-daemon/bin/info /info
``` ```
How to **start** c-daemon + go processes: How to **start** c-daemon + go processes:

43
c-daemon/daemon/daemon.c
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@ -8,35 +8,63 @@
#include <linux/limits.h> #include <linux/limits.h>
#define NR_OPEN 1024 #define NR_OPEN 1024
void logg(int num){
printf("You are in: %d\n",num);
}
int _daemon(int nochdir, int noclose){ int _daemon(int nochdir, int noclose){
pid_t pid, sid; pid_t pid, sid;
// pid_t defined in sys/types.h // pid_t defined in sys/types.h
// pid_t is a signed int data type // pid_t is a signed int data type
logg(1);
pid = fork(); // fork of the parent process pid = fork(); // fork of the parent process
// fork() function defined in unistd.h // fork() function defined in unistd.h
logg(2);
if (pid < 0){ if (pid < 0){
logg(3);
exit(EXIT_FAILURE); // exit and EXIT_FAILURE defined in stdlib.h exit(EXIT_FAILURE); // exit and EXIT_FAILURE defined in stdlib.h
} }
else if (pid > 0){ else if (pid > 0){
logg(4);
exit(EXIT_SUCCESS); exit(EXIT_SUCCESS);
} }
// sid = setsid();
// if (sid < 0) { logg(5);
// exit(EXIT_FAILURE); sid = setsid();
// } logg(8);
// if ((chdir("/")) < 0) {
// exit(EXIT_FAILURE); if (sid < 0) {
// } logg(9);
exit(EXIT_FAILURE);
}
logg(10);
if ((chdir("/")) < 0) {
logg(11);
exit(EXIT_FAILURE);
}
// logg(11);
// if (!noclose) { // if (!noclose) {
// logg(12);
// for (int i = 0; i < NR_OPEN; i++) // for (int i = 0; i < NR_OPEN; i++)
// close(i); // close(i);
// logg(13);
// open("/dev/null", O_RDWR); // open("/dev/null", O_RDWR);
// logg(14);
// dup(0); // dup(0);
// logg(15);
// dup(0); // dup(0);
// logg(16);
// } // }
// close(STDOUT_FILENO); // close(STDOUT_FILENO);
// close(STDERR_FILENO); // close(STDERR_FILENO);
while (1) { while (1) {
logg(6);
int status = system("./info"); int status = system("./info");
// TODO SECURITY ISSUE // TODO SECURITY ISSUE
// LINK https://stackoverflow.com/questions/5237482/how-do-i-execute-an-external-program-within-c-code-in-linux-with-arguments# // LINK https://stackoverflow.com/questions/5237482/how-do-i-execute-an-external-program-within-c-code-in-linux-with-arguments#
@ -44,5 +72,6 @@ int _daemon(int nochdir, int noclose){
sleep(1); sleep(1);
} }
logg(7);
exit(EXIT_SUCCESS); exit(EXIT_SUCCESS);
} }