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12bd0472d2
We're not dealing with a debugged process having its own controlling terminal at this point, so no need to make the new process a session leader. Simply making the process a group leader will suffice for our purposes at the moment.
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
#include "exec_darwin.h"
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extern char** environ;
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int
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fork_exec(char *argv0, char **argv, int size,
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mach_port_name_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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// In order to call PT_SIGEXC below, we must ensure that we have acquired the mach task first.
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// We facilitate this by creating a pipe and using it to let the forked process know that we've
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// finishing acquiring the mach task, and it can go ahead with the calls to PT_TRACE_ME and PT_SIGEXC.
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int fd[2];
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if (pipe(fd) < 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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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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return pid;
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}
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// Fork succeeded, we are in the child.
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int pret;
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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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return -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) return -errno;
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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) return -errno;
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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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exit(1);
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}
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