ex/ex_shell.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "$Id: ex_shell.c,v 8.17 1993/12/23 16:49:18 bostic Exp $ (Berkeley) $Date: 1993/12/23 16:49:18 $";
  10 #endif /* not lint */
  11
  12 #include <sys/param.h>
  13 #include <sys/stat.h>
  14
  15 #include <curses.h>
  16 #include <errno.h>
  17 #include <string.h>
  18 #include <unistd.h>
  19
  20 #include "vi.h"
  21 #include "excmd.h"
  22 #include "../svi/svi_screen.h"
  23
  24 /*
  25  * ex_shell -- :sh[ell]
  26  *      Invoke the program named in the SHELL environment variable
  27  *      with the argument -i.
  28  */
  29 int
  30 ex_shell(sp, ep, cmdp)
  31         SCR *sp;
  32         EXF *ep;
  33         EXCMDARG *cmdp;
  34 {
  35         char buf[MAXPATHLEN];
  36
  37         (void)snprintf(buf, sizeof(buf), "%s -i", O_STR(sp, O_SHELL));
  38         return (ex_exec_proc(sp, buf, "\n", NULL));
  39 }
  40
  41 /*
  42  * ex_exec_proc --
  43  *      Run a separate process.
  44  */
  45 int
  46 ex_exec_proc(sp, cmd, p1, p2)
  47         SCR *sp;
  48         char *cmd, *p1, *p2;
  49 {
  50         struct sigaction act, oact;
  51         struct stat osb, sb;
  52         struct termios term;
  53         const char *name;
  54         pid_t pid;
  55         int isig, rval;
  56
  57         /* Clear the rest of the screen. */
  58         if (sp->s_clear(sp))
  59                 return (1);
  60
  61         /* Save ex/vi terminal settings, and restore the original ones. */
  62         EX_LEAVE(sp, isig, act, oact, sb, osb, term);
  63
  64         /* Put out various messages. */
  65         if (p1 != NULL)
  66                 (void)write(STDOUT_FILENO, p1, strlen(p1));
  67         if (p2 != NULL)
  68                 (void)write(STDOUT_FILENO, p2, strlen(p2));
  69
  70
  71         switch (pid = vfork()) {
  72         case -1:                        /* Error. */
  73                 msgq(sp, M_SYSERR, "vfork");
  74                 rval = 1;
  75                 goto err;
  76         case 0:                         /* Utility. */
  77                 /*
  78                  * The utility has default signal behavior.  Don't bother
  79                  * using sigaction(2) 'cause we want the default behavior.
  80                  */
  81                 (void)signal(SIGINT, SIG_DFL);
  82                 (void)signal(SIGQUIT, SIG_DFL);
  83
  84                 if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL)
  85                         name = O_STR(sp, O_SHELL);
  86                 else
  87                         ++name;
  88                 execl(O_STR(sp, O_SHELL), name, "-c", cmd, NULL);
  89                 msgq(sp, M_ERR, "Error: execl: %s: %s",
  90                     O_STR(sp, O_SHELL), strerror(errno));
  91                 _exit(127);
  92                 /* NOTREACHED */
  93         }
  94
  95         rval = proc_wait(sp, (long)pid, cmd, 0);
  96
  97         /* Restore ex/vi terminal settings. */
  98 err:    EX_RETURN(sp, isig, act, oact, sb, osb, term);
  99
 100         /*
 101          * XXX
 102          * EX_LEAVE/EX_RETURN only give us 1-second resolution on the tty
 103          * changes.  A fast '!' command, e.g. ":!pwd" can beat us to the
 104          * refresh.  When there's better resolution from the stat(2) timers,
 105          * this can go away.
 106          */
 107         F_SET(sp, S_REFRESH);
 108
 109         return (rval);
 110 }