main.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <event2/event.h>
#include <amxc/amxc.h>
#include <amxp/amxp_signal.h>
#include <amxp/amxp_slot.h>
#include <amxp/amxp_syssig.h>
#include <amxp/amxp_subproc.h>

Go to the source code of this file.

Macros
#define	UNUSED   __attribute__((unused))

Functions
static void	signal_cb (__attribute__((unused)) evutil_socket_t fd, __attribute__((unused)) short event, __attribute__((unused)) void *arg)
static void	child_stdout_cb (evutil_socket_t fd, __attribute__((unused)) short event, __attribute__((unused)) void *arg)
static void	slot_proc_stop (const char *const sig_name, const amxc_var_t *const data, __attribute__((unused)) void *priv)
int	main (void)

Variables
static struct event_base *	base = NULL

Macro Definition Documentation

UNUSED

#define UNUSED   __attribute__((unused))

Definition at line 68 of file main.c.

Function Documentation

child_stdout_cb()

static void child_stdout_cb ( evutil_socket_t  fd, __attribute__((unused)) short  event, __attribute__((unused)) void *  arg  )

static

Definition at line 78 of file main.c.

                                              {
    char buffer[1024] = {0};
    ssize_t size = read(fd, buffer, 1023);
 
    if(size > 0) {
        buffer[size + 1] = 0;
        printf("%s", buffer);
    }
}

main()

int main

(

void

)

Definition at line 99 of file main.c.

               {
    int ret = 0;
    int sig_fd = -1;
    struct event* sig_event = NULL;
 
    int child_stdout_fd = -1;
    struct event* child_stdout_event = NULL;
    amxp_subproc_t* proc = NULL;
    char* cmd[] = { "ls", "-la", NULL };
 
    // allocate new proc object and connect to stop signal
    if(amxp_subproc_new(&proc) != 0) {
        exit(1);
    }
    amxp_slot_connect(amxp_subproc_get_sigmngr(proc), "stop", NULL, slot_proc_stop, NULL);
 
    // allocate new eventloop
    base = event_base_new();
    if(base == NULL) {
        exit(2);
    }
 
    // add file descriptors to event loop
    // add signal fd to eventloop
    sig_fd = amxp_syssig_get_fd(); // needed for SIGCHLD
    sig_event = event_new(base, sig_fd, EV_READ | EV_PERSIST, signal_cb, NULL);
    event_add(sig_event, NULL);
    // add child proc stdout to eventloop
    child_stdout_fd = amxp_subproc_open_fd(proc, STDOUT_FILENO);
    child_stdout_event = event_new(base, child_stdout_fd, EV_READ | EV_PERSIST, child_stdout_cb, NULL);
    event_add(child_stdout_event, NULL);
 
    // launch the process
    amxp_subproc_vstart(proc, cmd);
    printf("Child process started pid = %d\n", amxp_subproc_get_pid(proc));
 
    // start the eventloop
    event_base_dispatch(base);
 
    // process is stopped, delete proc object
    amxp_subproc_delete(&proc);
 
    // cleanup event loop
    event_del(sig_event);
    event_free(sig_event);
    event_del(child_stdout_event);
    event_free(child_stdout_event);
    event_base_free(base);
 
    return ret;
}

signal_cb()

static void signal_cb ( __attribute__((unused)) evutil_socket_t  fd, __attribute__((unused)) short  event, __attribute__((unused)) void *  arg  )

static

Definition at line 72 of file main.c.

                                        {
    amxp_syssig_read();
}

slot_proc_stop()

static void slot_proc_stop ( const char *const  sig_name, const amxc_var_t *const  data, __attribute__((unused)) void *  priv  )

static

Definition at line 90 of file main.c.

                                              {
    int pid = amxc_var_dyncast(int64_t, amxc_var_get_key(data, "PID", AMXC_VAR_FLAG_DEFAULT));
    printf("AMX Signal recieved : %s\n", sig_name);
    printf(" => process id = %d\n", pid);
    event_base_loopbreak(base);
}

Variable Documentation

base

struct event_base* base = NULL

static

Definition at line 70 of file main.c.