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 extern char **environ;
  58 int spawn(char *program, char *argv[], int sin, int sout, int serr,
  59           int search, char *envp[], char *pty_name, int wait)
  60 {
  61     int pid = fork();
  62     int fd;
  63     sigset_t sset;
  64
  65     if (pid != 0)
  66         return pid;
  67
  68     /* Put us in our own process group, but only if we need not
  69      * share stdin with our parent. In the latter case we claim
  70      * control of the terminal. */
  71     if (sin >= 0) {
  72 #if defined(LISP_FEATURE_HPUX)
  73       setsid();
  74 #elif defined(LISP_FEATURE_DARWIN)
  75       setpgid(0, getpid());
  76 #elif defined(SVR4) || defined(__linux__) || defined(__osf__)
  77       setpgrp();
  78 #else
  79       setpgrp(0, getpid());
  80 #endif
  81     } else {
  82       tcsetpgrp(0, getpgrp());
  83     }
  84
  85     /* unblock signals */
  86     sigemptyset(&sset);
  87     sigprocmask(SIG_SETMASK, &sset, NULL);
  88
  89     /* If we are supposed to be part of some other pty, go for it. */
  90     if (pty_name) {
  91 #if !defined(LISP_FEATURE_HPUX) && !defined(SVR4)
  92         fd = open("/dev/tty", O_RDWR, 0);
  93         if (fd >= 0) {
  94             ioctl(fd, TIOCNOTTY, 0);
  95             close(fd);
  96         }
  97 #endif
  98         fd = open(pty_name, O_RDWR, 0);
  99         dup2(fd, 0);
 100         set_noecho(0);
 101         dup2(fd, 1);
 102         dup2(fd, 2);
 103         close(fd);
 104     } else{
 105     /* Set up stdin, stdout, and stderr */
 106     if (sin >= 0)
 107         dup2(sin, 0);
 108     if (sout >= 0)
 109         dup2(sout, 1);
 110     if (serr >= 0)
 111         dup2(serr, 2);
 112     }
 113     /* Close all other fds. */
 114 #ifdef SVR4
 115     for (fd = sysconf(_SC_OPEN_MAX)-1; fd >= 3; fd--)
 116         close(fd);
 117 #else
 118     for (fd = getdtablesize()-1; fd >= 3; fd--)
 119         close(fd);
 120 #endif
 121
 122     environ = envp;
 123     /* Exec the program. */
 124     if (search)
 125       execvp(program, argv);
 126     else
 127       execv(program, argv);
 128
 129     exit (1);
 130 }
 131 #else  /* !LISP_FEATURE_WIN32 */
 132
 133 #  include <windows.h>
 134 #  include <process.h>
 135 #  include <stdio.h>
 136 #  include <stdlib.h>
 137 #  include <fcntl.h>
 138 #  include <io.h>
 139
 140 #define   READ_HANDLE  0
 141 #define   WRITE_HANDLE 1
 142
 143 /* These functions do not attempt to deal with wchar_t variations. */
 144
 145 /* Get the value of _environ maintained by MSVCRT */
 146 char **msvcrt_environ ( void ) {
 147     return ( _environ );
 148 }
 149
 150 /* Set up in, out, err pipes and spawn a program, waiting or otherwise. */
 151 HANDLE spawn (
 152     const char *program,
 153     const char *const *argv,
 154     int in,
 155     int out,
 156     int err,
 157     int search,
 158     char *envp,
 159     char *ptyname,
 160     int wait
 161     )
 162 {
 163     int stdout_backup, stdin_backup, stderr_backup, wait_mode;
 164     HANDLE hProcess;
 165     HANDLE hReturn;
 166
 167     /* Duplicate and save the original stdin/out/err handles. */
 168     stdout_backup = _dup (  _fileno ( stdout ) );
 169     stdin_backup  = _dup (  _fileno ( stdin  ) );
 170     stderr_backup = _dup (  _fileno ( stderr ) );
 171
 172     /* If we are not using stdin/out/err
 173      * then duplicate the new pipes to current stdin/out/err handles.
 174      *
 175      * Default std fds are used if in, out or err parameters
 176      * are -1. */
 177
 178     hReturn = (HANDLE)-1;
 179     hProcess = (HANDLE)-1;
 180     if ( ( out >= 0 ) && ( out != _fileno ( stdout ) ) ) {
 181         if ( _dup2 ( out, _fileno ( stdout ) ) != 0 ) goto error_exit;
 182     }
 183     if ( ( in >= 0 ) && ( in != _fileno ( stdin ) ) ) {
 184         if ( _dup2 ( in,  _fileno ( stdin )  ) != 0 ) goto error_exit_out;
 185     }
 186     if ( ( err >= 0 ) && ( err != _fileno ( stderr ) ) ) {
 187         if ( _dup2 ( err, _fileno ( stderr ) ) != 0 ) goto error_exit_in;
 188     }
 189
 190     /* Set the wait mode. */
 191     if ( 0 == wait ) {
 192         wait_mode = P_NOWAIT;
 193     } else {
 194         wait_mode = P_WAIT;
 195     }
 196
 197     /* Spawn process given on the command line*/
 198     if (search)
 199         hProcess = (HANDLE) spawnvp ( wait_mode, program, argv );
 200     else
 201         hProcess = (HANDLE) spawnv ( wait_mode, program, argv );
 202
 203     /* Now that the process is launched, replace the original
 204      * in/out/err handles and close the backups. */
 205
 206     if ( _dup2 ( stderr_backup, _fileno ( stderr ) ) != 0 ) goto error_exit;
 207  error_exit_in:
 208     if ( _dup2 ( stdin_backup,  _fileno ( stdin )  ) != 0 ) goto error_exit;
 209  error_exit_out:
 210     if ( _dup2 ( stdout_backup, _fileno ( stdout ) ) != 0 ) goto error_exit;
 211
 212     hReturn = hProcess;
 213
 214  error_exit:
 215     close ( stdout_backup );
 216     close ( stdin_backup  );
 217     close ( stderr_backup );
 218
 219     return hReturn;
 220
 221 }
 222
 223
 224 #endif /* !LISP_FEATURE_WIN32 */