mirror of
https://github.com/beego/bee.git
synced 2024-11-05 22:00:54 +00:00
113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
#include "exec_darwin.h"
|
|
#include "stdio.h"
|
|
|
|
extern char** environ;
|
|
|
|
int
|
|
close_exec_pipe(int fd[2]) {
|
|
if (pipe(fd) < 0) return -1;
|
|
if (fcntl(fd[0], F_SETFD, FD_CLOEXEC) < 0) return -1;
|
|
if (fcntl(fd[1], F_SETFD, FD_CLOEXEC) < 0) return -1;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fork_exec(char *argv0, char **argv, int size,
|
|
char *wd,
|
|
task_t *task,
|
|
mach_port_t *port_set,
|
|
mach_port_t *exception_port,
|
|
mach_port_t *notification_port)
|
|
{
|
|
// Since we're using mach exceptions instead of signals,
|
|
// we need to coordinate between parent and child via pipes
|
|
// to ensure that the parent has set the exception ports on
|
|
// the child task before it execs.
|
|
int fd[2];
|
|
if (close_exec_pipe(fd) < 0) return -1;
|
|
|
|
// Create another pipe to signal the parent on exec.
|
|
int efd[2];
|
|
if (close_exec_pipe(efd) < 0) return -1;
|
|
|
|
kern_return_t kret;
|
|
pid_t pid = fork();
|
|
if (pid > 0) {
|
|
// In parent.
|
|
close(fd[0]);
|
|
close(efd[1]);
|
|
kret = acquire_mach_task(pid, task, port_set, exception_port, notification_port);
|
|
if (kret != KERN_SUCCESS) return -1;
|
|
|
|
char msg = 'c';
|
|
write(fd[1], &msg, 1);
|
|
close(fd[1]);
|
|
|
|
char w;
|
|
size_t n = read(efd[0], &w, 1);
|
|
close(efd[0]);
|
|
if (n != 0) {
|
|
// Child died, reap it.
|
|
waitpid(pid, NULL, 0);
|
|
return -1;
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
// Fork succeeded, we are in the child.
|
|
int pret, cret;
|
|
char sig;
|
|
|
|
close(fd[1]);
|
|
read(fd[0], &sig, 1);
|
|
close(fd[0]);
|
|
|
|
// Create a new process group.
|
|
if (setpgid(0, 0) < 0) {
|
|
perror("setpgid");
|
|
exit(1);
|
|
}
|
|
|
|
// Set errno to zero before a call to ptrace.
|
|
// It is documented that ptrace can return -1 even
|
|
// for successful calls.
|
|
errno = 0;
|
|
pret = ptrace(PT_TRACE_ME, 0, 0, 0);
|
|
if (pret != 0 && errno != 0) {
|
|
perror("ptrace");
|
|
exit(1);
|
|
}
|
|
|
|
// Change working directory if wd is not empty.
|
|
if (wd && wd[0]) {
|
|
errno = 0;
|
|
cret = chdir(wd);
|
|
if (cret != 0 && errno != 0) {
|
|
char *error_msg;
|
|
asprintf(&error_msg, "%s '%s'", "chdir", wd);
|
|
perror(error_msg);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
errno = 0;
|
|
pret = ptrace(PT_SIGEXC, 0, 0, 0);
|
|
if (pret != 0 && errno != 0) {
|
|
perror("ptrace");
|
|
exit(1);
|
|
}
|
|
|
|
sleep(1);
|
|
|
|
// Create the child process.
|
|
execve(argv0, argv, environ);
|
|
|
|
// We should never reach here, but if we did something went wrong.
|
|
// Write a message to parent to alert that exec failed.
|
|
char msg = 'd';
|
|
write(efd[1], &msg, 1);
|
|
close(efd[1]);
|
|
|
|
exit(1);
|
|
}
|