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 #include <sys/wait.h>
  29 #include <sys/ioctl.h>
  30 #include <termios.h>
  31 #include <errno.h>
  32
  33 #ifdef LISP_FEATURE_OPENBSD
  34 /* FIXME: there has to be a better way to avoid ./util.h here */
  35 #include </usr/include/util.h>
  36 #endif
  37
  38 /* borrowed from detachtty's detachtty.c, in turn borrowed from APUE
  39  * example code found at
  40  * http://www.yendor.com/programming/unix/apue/pty/main.c
  41
  42 -brkint
  43
  44  */
  45
  46 int set_noecho(int fd)
  47 {
  48     struct termios  stermios;
  49
  50     if (tcgetattr(fd, &stermios) < 0) return 0;
  51
  52     stermios.c_lflag &= ~(  ECHO | /* ECHOE |  ECHOK | */  ECHONL);
  53     stermios.c_oflag |= (ONLCR);
  54     stermios.c_iflag &= ~(BRKINT);
  55     stermios.c_iflag |= (ICANON|ICRNL);
  56
  57     stermios.c_cc[VERASE]=0177;
  58     if (tcsetattr(fd, TCSANOW, &stermios) < 0) return 0;
  59     return 1;
  60 }
  61
  62 #if defined(LISP_FEATURE_OPENBSD)
  63
  64 int
  65 set_pty(char *pty_name)
  66 {
  67     int fd;
  68
  69     if ((fd = open(pty_name, O_RDWR, 0)) == -1 ||
  70         login_tty(fd) == -1)
  71         return (0);
  72     return (set_noecho(STDIN_FILENO));
  73 }
  74
  75 #else /* !LISP_FEATURE_OPENBSD */
  76
  77 int
  78 set_pty(char *pty_name)
  79 {
  80     int fd;
  81
  82 #if !defined(LISP_FEATURE_HPUX) && !defined(SVR4)
  83     fd = open("/dev/tty", O_RDWR, 0);
  84     if (fd >= 0) {
  85         ioctl(fd, TIOCNOTTY, 0);
  86         close(fd);
  87     }
  88 #endif
  89     if ((fd = open(pty_name, O_RDWR, 0)) == -1)
  90         return (-1);
  91     dup2(fd, 0);
  92     set_noecho(0);
  93     dup2(fd, 1);
  94     dup2(fd, 2);
  95     close(fd);
  96     return (0);
  97 }
  98
  99 #endif /* !LISP_FEATURE_OPENBSD */
 100
 101 extern char **environ;
 102 int spawn(char *program, char *argv[], int sin, int sout, int serr,
 103           int search, char *envp[], char *pty_name, int wait, char *pwd)
 104 {
 105     pid_t pid;
 106     int fd;
 107     int channel[2];
 108     sigset_t sset;
 109     int failure_code = 2;
 110
 111     channel[0] = -1;
 112     channel[1] = -1;
 113     if (!pipe(channel)) {
 114         if (-1==fcntl(channel[1], F_SETFD,  FD_CLOEXEC)) {
 115             close(channel[1]);
 116             channel[1] = -1;
 117         }
 118     }
 119
 120     pid = fork();
 121     if (pid) {
 122         if ((-1 != pid) && (-1 != channel[1])) {
 123             int child_errno = 0;
 124             int bytes = sizeof(int);
 125             int n;
 126             char *p = (char*)&child_errno;
 127             close(channel[1]);
 128             /* Try to read child errno from channel. */
 129             while ((bytes > 0) &&
 130                    (n = read(channel[0], p, bytes))) {
 131                 if (-1 == n) {
 132                     if (EINTR == errno) {
 133                         continue;
 134                     } else {
 135                         break;
 136                     }
 137                 } else {
 138                     bytes -= n;
 139                     p += n;
 140                 }
 141             }
 142             close(channel[0]);
 143             if (child_errno) {
 144                 int status;
 145                 waitpid(pid, &status, 0);
 146                 /* Our convention to tell Lisp that it was the exec or
 147                    chdir that failed, not the fork. */
 148                 /* FIXME: there are other values waitpid(2) can return. */
 149                 if (WIFEXITED(status)) {
 150                   pid = -WEXITSTATUS(status);
 151                 }
 152                 errno = child_errno;
 153             }
 154         }
 155         return pid;
 156     }
 157     close (channel[0]);
 158
 159     /* Put us in our own process group, but only if we need not
 160      * share stdin with our parent. In the latter case we claim
 161      * control of the terminal. */
 162     if (sin >= 0) {
 163 #if defined(LISP_FEATURE_HPUX) || defined(LISP_FEATURE_OPENBSD)
 164       setsid();
 165 #elif defined(LISP_FEATURE_DARWIN)
 166       setpgid(0, getpid());
 167 #elif defined(SVR4) || defined(__linux__) || defined(__osf__) || defined(__GLIBC__)
 168       setpgrp();
 169 #else
 170       setpgrp(0, getpid());
 171 #endif
 172     } else {
 173       tcsetpgrp(0, getpgrp());
 174     }
 175
 176     /* unblock signals */
 177     sigemptyset(&sset);
 178     sigprocmask(SIG_SETMASK, &sset, NULL);
 179
 180     /* If we are supposed to be part of some other pty, go for it. */
 181     if (pty_name)
 182         set_pty(pty_name);
 183     else {
 184     /* Set up stdin, stdout, and stderr */
 185     if (sin >= 0)
 186         dup2(sin, 0);
 187     if (sout >= 0)
 188         dup2(sout, 1);
 189     if (serr >= 0)
 190         dup2(serr, 2);
 191     }
 192     /* Close all other fds. */
 193 #ifdef SVR4
 194     for (fd = sysconf(_SC_OPEN_MAX)-1; fd >= 3; fd--)
 195         if (fd != channel[1]) close(fd);
 196 #else
 197     for (fd = getdtablesize()-1; fd >= 3; fd--)
 198         if (fd != channel[1]) close(fd);
 199 #endif
 200
 201     if (pwd && chdir(pwd) < 0) {
 202        failure_code = 3;
 203     } else {
 204         if (envp) {
 205             environ = envp;
 206         }
 207         /* Exec the program. */
 208         if (search)
 209             execvp(program, argv);
 210         else
 211             execv(program, argv);
 212     }
 213
 214     /* When exec or chdir fails and channel is available, send the errno value. */
 215     if (-1 != channel[1]) {
 216         int our_errno = errno;
 217         int bytes = sizeof(int);
 218         int n;
 219         char *p = (char*)&our_errno;
 220         while ((bytes > 0) &&
 221                (n = write(channel[1], p, bytes))) {
 222             if (-1 == n) {
 223                 if (EINTR == errno) {
 224                     continue;
 225                 } else {
 226                     break;
 227                 }
 228             } else {
 229                 bytes -= n;
 230                 p += n;
 231             }
 232         }
 233         close(channel[1]);
 234     }
 235     _exit(failure_code);
 236 }
 237 #else  /* !LISP_FEATURE_WIN32 */
 238
 239 #  include <windows.h>
 240 #  include <process.h>
 241 #  include <stdio.h>
 242 #  include <stdlib.h>
 243 #  include <fcntl.h>
 244 #  include <io.h>
 245
 246 #define   READ_HANDLE  0
 247 #define   WRITE_HANDLE 1
 248
 249 /* These functions do not attempt to deal with wchar_t variations. */
 250
 251 /* Get the value of _environ maintained by MSVCRT */
 252 char **msvcrt_environ ( void ) {
 253     return ( _environ );
 254 }
 255
 256 /* Set up in, out, err pipes and spawn a program, waiting or otherwise. */
 257 HANDLE spawn (
 258     const char *program,
 259     const char *const *argv,
 260     int in,
 261     int out,
 262     int err,
 263     int search,
 264     char *envp,
 265     char *ptyname,
 266     int wait,
 267     char *pwd
 268     )
 269 {
 270     int stdout_backup, stdin_backup, stderr_backup, wait_mode;
 271     HANDLE hProcess;
 272     HANDLE hReturn;
 273
 274     /* Duplicate and save the original stdin/out/err handles. */
 275     stdout_backup = _dup (  _fileno ( stdout ) );
 276     stdin_backup  = _dup (  _fileno ( stdin  ) );
 277     stderr_backup = _dup (  _fileno ( stderr ) );
 278
 279     /* If we are not using stdin/out/err
 280      * then duplicate the new pipes to current stdin/out/err handles.
 281      *
 282      * Default std fds are used if in, out or err parameters
 283      * are -1. */
 284
 285     hReturn = (HANDLE)-1;
 286     hProcess = (HANDLE)-1;
 287     if ( ( out >= 0 ) && ( out != _fileno ( stdout ) ) ) {
 288         if ( _dup2 ( out, _fileno ( stdout ) ) != 0 ) goto error_exit;
 289     }
 290     if ( ( in >= 0 ) && ( in != _fileno ( stdin ) ) ) {
 291         if ( _dup2 ( in,  _fileno ( stdin )  ) != 0 ) goto error_exit_out;
 292     }
 293     if ( ( err >= 0 ) && ( err != _fileno ( stderr ) ) ) {
 294         if ( _dup2 ( err, _fileno ( stderr ) ) != 0 ) goto error_exit_in;
 295     }
 296
 297     /* Set the wait mode. */
 298     if ( 0 == wait ) {
 299         wait_mode = P_NOWAIT;
 300     } else {
 301         wait_mode = P_WAIT;
 302     }
 303
 304     /* Change working directory if supplied. */
 305     if (pwd) {
 306         if (chdir(pwd) < 0) {
 307             goto error_exit;
 308         }
 309     }
 310
 311     /* Spawn process given on the command line*/
 312     if (search)
 313         hProcess = (HANDLE) spawnvp ( wait_mode, program, (char* const* )argv );
 314     else
 315         hProcess = (HANDLE) spawnv ( wait_mode, program, (char* const* )argv );
 316
 317     /* Now that the process is launched, replace the original
 318      * in/out/err handles and close the backups. */
 319
 320     if ( _dup2 ( stderr_backup, _fileno ( stderr ) ) != 0 ) goto error_exit;
 321  error_exit_in:
 322     if ( _dup2 ( stdin_backup,  _fileno ( stdin )  ) != 0 ) goto error_exit;
 323  error_exit_out:
 324     if ( _dup2 ( stdout_backup, _fileno ( stdout ) ) != 0 ) goto error_exit;
 325
 326     hReturn = hProcess;
 327
 328  error_exit:
 329     close ( stdout_backup );
 330     close ( stdin_backup  );
 331     close ( stderr_backup );
 332
 333     return hReturn;
 334
 335 }
 336
 337
 338 #endif /* !LISP_FEATURE_WIN32 */