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