1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 #include "config.h" 11 12 #include <sys/queue.h> 13 #include <sys/time.h> 14 #include <sys/wait.h> 15 16 #include <bitstring.h> 17 #include <ctype.h> 18 #include <errno.h> 19 #include <limits.h> 20 #include <signal.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <unistd.h> 25 26 #include "../common/common.h" 27 28 static const char *sigmsg(int); 29 30 /* 31 * ex_shell -- :sh[ell] 32 * Invoke the program named in the SHELL environment variable 33 * with the argument -i. 34 * 35 * PUBLIC: int ex_shell(SCR *, EXCMD *); 36 */ 37 int 38 ex_shell(SCR *sp, EXCMD *cmdp) 39 { 40 int rval; 41 char *buf; 42 43 /* We'll need a shell. */ 44 if (opts_empty(sp, O_SHELL, 0)) 45 return (1); 46 47 /* 48 * XXX 49 * Assumes all shells use -i. 50 */ 51 (void)asprintf(&buf, "%s -i", O_STR(sp, O_SHELL)); 52 if (buf == NULL) { 53 msgq(sp, M_SYSERR, NULL); 54 return (1); 55 } 56 57 /* Restore the window name. */ 58 (void)sp->gp->scr_rename(sp, NULL, 0); 59 60 /* If we're still in a vi screen, move out explicitly. */ 61 rval = ex_exec_proc(sp, cmdp, buf, NULL, !F_ISSET(sp, SC_SCR_EXWROTE)); 62 free(buf); 63 64 /* Set the window name. */ 65 (void)sp->gp->scr_rename(sp, sp->frp->name, 1); 66 67 /* 68 * !!! 69 * Historically, vi didn't require a continue message after the 70 * return of the shell. Match it. 71 */ 72 F_SET(sp, SC_EX_WAIT_NO); 73 74 return (rval); 75 } 76 77 /* 78 * ex_exec_proc -- 79 * Run a separate process. 80 * 81 * PUBLIC: int ex_exec_proc(SCR *, EXCMD *, char *, const char *, int); 82 */ 83 int 84 ex_exec_proc(SCR *sp, EXCMD *cmdp, char *cmd, const char *msg, int need_newline) 85 { 86 GS *gp; 87 const char *name; 88 pid_t pid; 89 90 gp = sp->gp; 91 92 /* We'll need a shell. */ 93 if (opts_empty(sp, O_SHELL, 0)) 94 return (1); 95 96 /* Enter ex mode. */ 97 if (F_ISSET(sp, SC_VI)) { 98 if (gp->scr_screen(sp, SC_EX)) { 99 ex_wemsg(sp, cmdp->cmd->name, EXM_NOCANON); 100 return (1); 101 } 102 (void)gp->scr_attr(sp, SA_ALTERNATE, 0); 103 F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE); 104 } 105 106 /* Put out additional newline, message. */ 107 if (need_newline) 108 (void)ex_puts(sp, "\n"); 109 if (msg != NULL) { 110 (void)ex_puts(sp, msg); 111 (void)ex_puts(sp, "\n"); 112 } 113 (void)ex_fflush(sp); 114 115 switch (pid = vfork()) { 116 case -1: /* Error. */ 117 msgq(sp, M_SYSERR, "vfork"); 118 return (1); 119 case 0: /* Utility. */ 120 if (gp->scr_child) 121 gp->scr_child(sp); 122 if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL) 123 name = O_STR(sp, O_SHELL); 124 else 125 ++name; 126 execl(O_STR(sp, O_SHELL), name, "-c", cmd, (char *)NULL); 127 msgq_str(sp, M_SYSERR, O_STR(sp, O_SHELL), "execl: %s"); 128 _exit(127); 129 /* NOTREACHED */ 130 default: /* Parent. */ 131 return (proc_wait(sp, (long)pid, cmd, 0, 0)); 132 } 133 /* NOTREACHED */ 134 } 135 136 /* 137 * proc_wait -- 138 * Wait for one of the processes. 139 * 140 * !!! 141 * The pid_t type varies in size from a short to a long depending on the 142 * system. It has to be cast into something or the standard promotion 143 * rules get you. I'm using a long based on the belief that nobody is 144 * going to make it unsigned and it's unlikely to be a quad. 145 * 146 * PUBLIC: int proc_wait(SCR *, long, const char *, int, int); 147 */ 148 int 149 proc_wait(SCR *sp, long int pid, const char *cmd, int silent, int okpipe) 150 { 151 size_t len; 152 int nf, pstat; 153 char *p; 154 155 /* Wait for the utility, ignoring interruptions. */ 156 for (;;) { 157 errno = 0; 158 if (waitpid((pid_t)pid, &pstat, 0) != -1) 159 break; 160 if (errno != EINTR) { 161 msgq(sp, M_SYSERR, "waitpid"); 162 return (1); 163 } 164 } 165 166 /* 167 * Display the utility's exit status. Ignore SIGPIPE from the 168 * parent-writer, as that only means that the utility chose to 169 * exit before reading all of its input. 170 */ 171 if (WIFSIGNALED(pstat) && (!okpipe || WTERMSIG(pstat) != SIGPIPE)) { 172 for (; cmdskip(*cmd); ++cmd); 173 p = msg_print(sp, cmd, &nf); 174 len = strlen(p); 175 msgq(sp, M_ERR, "%.*s%s: received signal: %s%s", 176 (int)MIN(len, 20), p, len > 20 ? " ..." : "", 177 sigmsg(WTERMSIG(pstat)), 178 WCOREDUMP(pstat) ? "; core dumped" : ""); 179 if (nf) 180 FREE_SPACE(sp, p, 0); 181 return (1); 182 } 183 184 if (WIFEXITED(pstat) && WEXITSTATUS(pstat)) { 185 /* 186 * Remain silent for "normal" errors when doing shell file 187 * name expansions, they almost certainly indicate nothing 188 * more than a failure to match. 189 * 190 * Remain silent for vi read filter errors. It's historic 191 * practice. 192 */ 193 if (!silent) { 194 for (; cmdskip(*cmd); ++cmd); 195 p = msg_print(sp, cmd, &nf); 196 len = strlen(p); 197 msgq(sp, M_ERR, "%.*s%s: exited with status %d", 198 (int)MIN(len, 20), p, len > 20 ? " ..." : "", 199 WEXITSTATUS(pstat)); 200 if (nf) 201 FREE_SPACE(sp, p, 0); 202 } 203 return (1); 204 } 205 return (0); 206 } 207 208 /* 209 * sigmsg -- 210 * Return a pointer to a message describing a signal. 211 */ 212 static const char * 213 sigmsg(int signo) 214 { 215 static char buf[40]; 216 char *message; 217 218 /* POSIX.1-2008 leaves strsignal(3)'s return value unspecified. */ 219 if ((message = strsignal(signo)) != NULL) 220 return message; 221 (void)snprintf(buf, sizeof(buf), "Unknown signal: %d", signo); 222 return (buf); 223 } 224