src/ipc.h

   1 #ifndef PIPE_H
   2 #define PIPE_H
   3
   4 #define _POSIX_C_SOURCE 200809L
   5 #include <signal.h>
   6 #include <sys/wait.h>
   7 #include <unistd.h>
   8 #include "try.h"
   9
  10 typedef struct {
  11         int read;
  12         int write;
  13 } Pipe;
  14
  15 static void interactive_signals(void (* const handler)(int)) {
  16         try_signal(SIGINT, handler);
  17         try_signal(SIGQUIT, handler);
  18         try_signal(SIGTSTP, handler);
  19 }
  20
  21 static Pipe make_pipe() {
  22         Pipe p;
  23         int fds[2];
  24         if (pipe(fds) == -1) {
  25                 pexit("pipe()");
  26         }
  27         p.read = fds[0];
  28         p.write = fds[1];
  29         return p;
  30 }
  31
  32 static void move_fd(int const old, int const new) {
  33         if (dup2(old, new) == -1) {
  34                 pexit("dup2()");
  35         }
  36         close(old);
  37 }
  38
  39 static int wait_script(pid_t const pid) {
  40         int status = try_waitpid(pid, WUNTRACED);
  41         while (WIFSTOPPED(status)) {
  42                 if (WSTOPSIG(status) == SIGTSTP) {
  43                         try_signal(SIGTSTP, SIG_DFL);
  44                         raise(SIGTSTP);
  45                         try_signal(SIGTSTP, SIG_IGN);
  46                 }
  47                 status = try_waitpid(pid, WUNTRACED);
  48         }
  49         if (WIFSIGNALED(status)) {
  50                 switch (WTERMSIG(status)) {
  51                 case SIGINT:
  52                         try_signal(SIGINT, SIG_DFL);
  53                         raise(SIGINT);
  54                 case SIGQUIT: exit(EXIT_FAILURE);
  55                 }
  56         }
  57         return status;
  58 }
  59
  60 #endif