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#include "../include/Process.hpp"
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#include <limits.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdlib.h>
namespace gsr {
static void debug_print_args(const char **args) {
fprintf(stderr, "gsr-overlay info: running command:");
while(*args) {
fprintf(stderr, " %s", *args);
++args;
}
fprintf(stderr, "\n");
}
bool exec_program_daemonized(const char **args) {
/* 1 argument */
if(args[0] == nullptr)
return false;
debug_print_args(args);
pid_t pid = vfork();
if(pid == -1) {
perror("Failed to vfork");
return false;
} else if(pid == 0) { /* child */
setsid();
signal(SIGHUP, SIG_IGN);
// Daemonize child to make the parent the init process which will reap the zombie child
pid_t second_child = vfork();
if(second_child == 0) { // child
execvp(args[0], (char* const*)args);
perror("execvp");
_exit(127);
} else if(second_child != -1) {
// TODO:
_exit(0);
}
} else { /* parent */
waitpid(pid, nullptr, 0);
}
return true;
}
pid_t exec_program(const char **args) {
/* 1 argument */
if(args[0] == nullptr)
return -1;
debug_print_args(args);
pid_t pid = vfork();
if(pid == -1) {
perror("Failed to vfork");
return -1;
} else if(pid == 0) { /* child */
execvp(args[0], (char* const*)args);
perror("execvp");
_exit(127);
} else { /* parent */
return pid;
}
}
bool read_cmdline_arg0(const char *filepath, char *output_buffer) {
output_buffer[0] = '\0';
const char *arg0_end = NULL;
int fd = open(filepath, O_RDONLY);
if(fd == -1)
return false;
char buffer[PATH_MAX];
ssize_t bytes_read = read(fd, buffer, sizeof(buffer));
if(bytes_read == -1)
goto err;
arg0_end = (const char*)memchr(buffer, '\0', bytes_read);
if(!arg0_end)
goto err;
memcpy(output_buffer, buffer, arg0_end - buffer);
output_buffer[arg0_end - buffer] = '\0';
close(fd);
return true;
err:
close(fd);
return false;
}
}
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