src/runtime/run-program.c

   1 /*
   2  * support for the Lisp function RUN-PROGRAM and friends
   3  */
   4
   5 /*
   6  * This software is part of the SBCL system. See the README file for
   7  * more information.
   8  *
   9  * This software is derived from the CMU CL system, which was
  10  * written at Carnegie Mellon University and released into the
  11  * public domain. The software is in the public domain and is
  12  * provided with absolutely no warranty. See the COPYING and CREDITS
  13  * files for more information.
  14  */
  15
  16 #include "sbcl.h"
  17
  18 #ifndef LISP_FEATURE_WIN32
  19
  20 #include <stdlib.h>
  21 #include <sys/file.h>
  22 #include <sys/types.h>
  23 #include <signal.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <sys/ioctl.h>
  27 #include <unistd.h>
  28
  29 #include <sys/ioctl.h>
  30 #include <termios.h>
  31
  32
  33 /* borrowed from detachtty's detachtty.c, in turn borrowed from APUE
  34  * example code found at
  35  * http://www.yendor.com/programming/unix/apue/pty/main.c
  36
  37 -brkint
  38
  39  */
  40
  41 int set_noecho(int fd)
  42 {
  43     struct termios  stermios;
  44
  45     if (tcgetattr(fd, &stermios) < 0) return 0;
  46
  47     stermios.c_lflag &= ~(  ECHO | /* ECHOE |  ECHOK | */  ECHONL);
  48     stermios.c_oflag |= (ONLCR);
  49     stermios.c_iflag &= ~(BRKINT);
  50     stermios.c_iflag |= (ICANON|ICRNL);
  51
  52     stermios.c_cc[VERASE]=0177;
  53     if (tcsetattr(fd, TCSANOW, &stermios) < 0) return 0;
  54     return 1;
  55 }
  56
  57 int spawn(char *program, char *argv[], char *envp[], char *pty_name,
  58           int stdin, int stdout, int stderr)
  59 {
  60     int pid = fork();
  61     int fd;
  62     sigset_t sset;
  63
  64     if (pid != 0)
  65         return pid;
  66
  67     /* Put us in our own process group. */
  68 #if defined(hpux)
  69     setsid();
  70 #elif defined(LISP_FEATURE_DARWIN)
  71     setpgid(0, getpid());
  72 #elif defined(SVR4) || defined(__linux__) || defined(__osf__)
  73     setpgrp();
  74 #else
  75     setpgrp(0, getpid());
  76 #endif
  77
  78     /* unblock signals */
  79     sigemptyset(&sset);
  80     sigprocmask(SIG_SETMASK, &sset, NULL);
  81
  82     /* If we are supposed to be part of some other pty, go for it. */
  83     if (pty_name) {
  84 #if !defined(hpux) && !defined(SVR4)
  85         fd = open("/dev/tty", O_RDWR, 0);
  86         if (fd >= 0) {
  87             ioctl(fd, TIOCNOTTY, 0);
  88             close(fd);
  89         }
  90 #endif
  91         fd = open(pty_name, O_RDWR, 0);
  92         dup2(fd, 0);
  93         set_noecho(0);
  94         dup2(fd, 1);
  95         dup2(fd, 2);
  96         close(fd);
  97     } else{
  98     /* Set up stdin, stdout, and stderr */
  99     if (stdin >= 0)
 100         dup2(stdin, 0);
 101     if (stdout >= 0)
 102         dup2(stdout, 1);
 103     if (stderr >= 0)
 104         dup2(stderr, 2);
 105     }
 106     /* Close all other fds. */
 107 #ifdef SVR4
 108     for (fd = sysconf(_SC_OPEN_MAX)-1; fd >= 3; fd--)
 109         close(fd);
 110 #else
 111     for (fd = getdtablesize()-1; fd >= 3; fd--)
 112         close(fd);
 113 #endif
 114
 115     /* Exec the program. */
 116     execve(program, argv, envp);
 117
 118     /* It didn't work, so try /bin/sh. */
 119     argv[0] = program;
 120     argv[-1] = "sh";
 121     execve("/bin/sh", argv-1, envp);
 122
 123     /* The exec didn't work, flame out. */
 124     exit(1);
 125 }
 126 #else  /* !LISP_FEATURE_WIN32 */
 127
 128 #  include <windows.h>
 129 #  include <process.h>
 130 #  include <stdio.h>
 131 #  include <stdlib.h>
 132 #  include <fcntl.h>
 133 #  include <io.h>
 134
 135 #define   READ_HANDLE  0
 136 #define   WRITE_HANDLE 1
 137
 138 /* These functions do not attempt to deal with wchar_t variations. */
 139
 140 /* Get the value of _environ maintained by MSVCRT */
 141 char **msvcrt_environ ( void ) {
 142     return ( _environ );
 143 }
 144
 145 /* Set up in, out, err pipes and spawn a program, waiting or otherwise. */
 146 HANDLE spawn (
 147     const char *program,
 148     const char *const *argv,
 149     int in,
 150     int out,
 151     int err,
 152     int wait
 153     )
 154 {
 155     int stdout_backup, stdin_backup, stderr_backup, wait_mode;
 156     HANDLE hProcess;
 157     HANDLE hReturn;
 158
 159     /* Duplicate and save the original stdin/out/err handles. */
 160     stdout_backup = _dup (  _fileno ( stdout ) );
 161     stdin_backup  = _dup (  _fileno ( stdin  ) );
 162     stderr_backup = _dup (  _fileno ( stderr ) );
 163
 164     /* If we are not using stdin/out/err
 165      * then duplicate the new pipes to current stdin/out/err handles.
 166      *
 167      * Default std fds are used if in, out or err parameters
 168      * are -1. */
 169
 170     hReturn = (HANDLE)-1;
 171     hProcess = (HANDLE)-1;
 172     if ( ( out >= 0 ) && ( out != _fileno ( stdout ) ) ) {
 173         if ( _dup2 ( out, _fileno ( stdout ) ) != 0 ) goto error_exit;
 174     }
 175     if ( ( in >= 0 ) && ( in != _fileno ( stdin ) ) ) {
 176         if ( _dup2 ( in,  _fileno ( stdin )  ) != 0 ) goto error_exit_out;
 177     }
 178     if ( ( err >= 0 ) && ( err != _fileno ( stderr ) ) ) {
 179         if ( _dup2 ( err, _fileno ( stderr ) ) != 0 ) goto error_exit_in;
 180     }
 181
 182     /* Set the wait mode. */
 183     if ( 0 == wait ) {
 184         wait_mode = P_NOWAIT;
 185     } else {
 186         wait_mode = P_WAIT;
 187     }
 188
 189     /* Spawn process given on the command line*/
 190     hProcess = (HANDLE) spawnvp ( wait_mode, program, argv );
 191
 192     /* Now that the process is launched, replace the original
 193      * in/out/err handles and close the backups. */
 194
 195     if ( _dup2 ( stderr_backup, _fileno ( stderr ) ) != 0 ) goto error_exit;
 196  error_exit_in:
 197     if ( _dup2 ( stdin_backup,  _fileno ( stdin )  ) != 0 ) goto error_exit;
 198  error_exit_out:
 199     if ( _dup2 ( stdout_backup, _fileno ( stdout ) ) != 0 ) goto error_exit;
 200
 201     hReturn = hProcess;
 202
 203  error_exit:
 204     close ( stdout_backup );
 205     close ( stdin_backup  );
 206     close ( stderr_backup );
 207
 208     return hReturn;
 209
 210 }
 211
 212
 213 #endif /* !LISP_FEATURE_WIN32 */