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