File: fork_exec_with_pty.c

package info (click to toggle)
haskell-posix-pty 0.2.1.1-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 104 kB
  • sloc: haskell: 242; ansic: 98; makefile: 6
file content (72 lines) | stat: -rw-r--r-- 1,588 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
#define _BSD_SOURCE
#include <sys/ioctl.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define TTYDEFCHARS
#include <termios.h>
#include <sys/ttydefaults.h>
#undef TTYDEFCHARS

#if defined(__APPLE__)
#include <util.h>
#elif defined(__GLIBC__)
#include <pty.h>
#else /* bsd without glibc */
#include <libutil.h>
#endif

#include <HsFFI.h>

#include "fork_exec_with_pty.h"

/* Should be exported by unistd.h, but isn't on OSX. */
extern char **environ;

/* Fork and exec with a pty, returning the fd of the master pty. */
int
fork_exec_with_pty
    ( HsInt sx
    , HsInt sy
    , int search
    , const char *file
    , char *const argv[]
    , char *const env[]
    , HsInt *child_pid
    )
{
    int pty;
    int packet_mode = 1;
    struct winsize ws;

    /* Set the terminal size and settings. */
    memset(&ws, 0, sizeof ws);
    ws.ws_col = sx;
    ws.ws_row = sy;

    /* Fork and exec, returning the master pty. */
    *child_pid = forkpty(&pty, NULL, NULL, &ws);
    switch (*child_pid) {
    case -1:
        return -1;
    case 0:
        /* If an environment is specified, override the old one. */
        if (env) environ = (char**) env;

        /* Search user's path or not. */
        if (search) execvp(file, argv);
        else        execv(file, argv);

        perror("exec failed");
        exit(EXIT_FAILURE);
    default:
        /* Switch the pty to packet mode, we'll deal with packeting on the
           haskell side of things. */
        if (ioctl(pty, TIOCPKT, &packet_mode) == -1) return 1;

        return pty;
    }
}