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/* $OpenBSD: ex_shell.c,v 1.11 2009/10/27 23:59:47 deraadt Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/wait.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../common/common.h"
static const char *sigmsg(int);
/*
* ex_shell -- :sh[ell]
* Invoke the program named in the SHELL environment variable
* with the argument -i.
*
* PUBLIC: int ex_shell(SCR *, EXCMD *);
*/
int
ex_shell(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
int rval;
char buf[MAXPATHLEN];
/* We'll need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
/*
* XXX
* Assumes all shells use -i.
*/
(void)snprintf(buf, sizeof(buf), "%s -i", O_STR(sp, O_SHELL));
/* Restore the window name. */
(void)sp->gp->scr_rename(sp, NULL, 0);
/* If we're still in a vi screen, move out explicitly. */
rval = ex_exec_proc(sp, cmdp, buf, NULL, !F_ISSET(sp, SC_SCR_EXWROTE));
/* Set the window name. */
(void)sp->gp->scr_rename(sp, sp->frp->name, 1);
/*
* !!!
* Historically, vi didn't require a continue message after the
* return of the shell. Match it.
*/
F_SET(sp, SC_EX_WAIT_NO);
return (rval);
}
/*
* ex_exec_proc --
* Run a separate process.
*
* PUBLIC: int ex_exec_proc(SCR *, EXCMD *, char *, const char *, int);
*/
int
ex_exec_proc(sp, cmdp, cmd, msg, need_newline)
SCR *sp;
EXCMD *cmdp;
char *cmd;
const char *msg;
int need_newline;
{
GS *gp;
const char *name;
pid_t pid;
gp = sp->gp;
/* We'll need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
/* Enter ex mode. */
if (F_ISSET(sp, SC_VI)) {
if (gp->scr_screen(sp, SC_EX)) {
ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON);
return (1);
}
(void)gp->scr_attr(sp, SA_ALTERNATE, 0);
F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
}
/* Put out additional newline, message. */
if (need_newline)
(void)ex_puts(sp, "\n");
if (msg != NULL) {
(void)ex_puts(sp, msg);
(void)ex_puts(sp, "\n");
}
(void)ex_fflush(sp);
switch (pid = vfork()) {
case -1: /* Error. */
msgq(sp, M_SYSERR, "vfork");
return (1);
case 0: /* Utility. */
if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL)
name = O_STR(sp, O_SHELL);
else
++name;
execl(O_STR(sp, O_SHELL), name, "-c", cmd, (char *)NULL);
msgq_str(sp, M_SYSERR, O_STR(sp, O_SHELL), "execl: %s");
_exit(127);
/* NOTREACHED */
default: /* Parent. */
return (proc_wait(sp, pid, cmd, 0, 0));
}
/* NOTREACHED */
}
/*
* proc_wait --
* Wait for one of the processes.
*
* !!!
* The pid_t type varies in size from a short to a long depending on the
* system. It has to be cast into something or the standard promotion
* rules get you. I'm using a long based on the belief that nobody is
* going to make it unsigned and it's unlikely to be a quad.
*
* PUBLIC: int proc_wait(SCR *, pid_t, const char *, int, int);
*/
int
proc_wait(sp, pid, cmd, silent, okpipe)
SCR *sp;
pid_t pid;
const char *cmd;
int silent, okpipe;
{
size_t len;
int nf, pstat;
char *p;
/* Wait for the utility, ignoring interruptions. */
for (;;) {
errno = 0;
if (waitpid(pid, &pstat, 0) != -1)
break;
if (errno != EINTR) {
msgq(sp, M_SYSERR, "waitpid");
return (1);
}
}
/*
* Display the utility's exit status. Ignore SIGPIPE from the
* parent-writer, as that only means that the utility chose to
* exit before reading all of its input.
*/
if (WIFSIGNALED(pstat) && (!okpipe || WTERMSIG(pstat) != SIGPIPE)) {
for (; isblank(*cmd); ++cmd);
p = msg_print(sp, cmd, &nf);
len = strlen(p);
msgq(sp, M_ERR, "%.*s%s: received signal: %s%s",
MIN(len, 20), p, len > 20 ? " ..." : "",
sigmsg(WTERMSIG(pstat)),
WCOREDUMP(pstat) ? "; core dumped" : "");
if (nf)
FREE_SPACE(sp, p, 0);
return (1);
}
if (WIFEXITED(pstat) && WEXITSTATUS(pstat)) {
/*
* Remain silent for "normal" errors when doing shell file
* name expansions, they almost certainly indicate nothing
* more than a failure to match.
*
* Remain silent for vi read filter errors. It's historic
* practice.
*/
if (!silent) {
for (; isblank(*cmd); ++cmd);
p = msg_print(sp, cmd, &nf);
len = strlen(p);
msgq(sp, M_ERR, "%.*s%s: exited with status %d",
MIN(len, 20), p, len > 20 ? " ..." : "",
WEXITSTATUS(pstat));
if (nf)
FREE_SPACE(sp, p, 0);
}
return (1);
}
return (0);
}
/*
* XXX
* The sys_siglist[] table in the C library has this information, but there's
* no portable way to get to it. (Believe me, I tried.)
*/
typedef struct _sigs {
int number; /* signal number */
char *message; /* related message */
} SIGS;
SIGS const sigs[] = {
#ifdef SIGABRT
{ SIGABRT, "Abort trap" },
#endif
#ifdef SIGALRM
{ SIGALRM, "Alarm clock" },
#endif
#ifdef SIGBUS
{ SIGBUS, "Bus error" },
#endif
#ifdef SIGCLD
{ SIGCLD, "Child exited or stopped" },
#endif
#ifdef SIGCHLD
{ SIGCHLD, "Child exited" },
#endif
#ifdef SIGCONT
{ SIGCONT, "Continued" },
#endif
#ifdef SIGDANGER
{ SIGDANGER, "System crash imminent" },
#endif
#ifdef SIGEMT
{ SIGEMT, "EMT trap" },
#endif
#ifdef SIGFPE
{ SIGFPE, "Floating point exception" },
#endif
#ifdef SIGGRANT
{ SIGGRANT, "HFT monitor mode granted" },
#endif
#ifdef SIGHUP
{ SIGHUP, "Hangup" },
#endif
#ifdef SIGILL
{ SIGILL, "Illegal instruction" },
#endif
#ifdef SIGINFO
{ SIGINFO, "Information request" },
#endif
#ifdef SIGINT
{ SIGINT, "Interrupt" },
#endif
#ifdef SIGIO
{ SIGIO, "I/O possible" },
#endif
#ifdef SIGIOT
{ SIGIOT, "IOT trap" },
#endif
#ifdef SIGKILL
{ SIGKILL, "Killed" },
#endif
#ifdef SIGLOST
{ SIGLOST, "Record lock" },
#endif
#ifdef SIGMIGRATE
{ SIGMIGRATE, "Migrate process to another CPU" },
#endif
#ifdef SIGMSG
{ SIGMSG, "HFT input data pending" },
#endif
#ifdef SIGPIPE
{ SIGPIPE, "Broken pipe" },
#endif
#ifdef SIGPOLL
{ SIGPOLL, "I/O possible" },
#endif
#ifdef SIGPRE
{ SIGPRE, "Programming error" },
#endif
#ifdef SIGPROF
{ SIGPROF, "Profiling timer expired" },
#endif
#ifdef SIGPWR
{ SIGPWR, "Power failure imminent" },
#endif
#ifdef SIGRETRACT
{ SIGRETRACT, "HFT monitor mode retracted" },
#endif
#ifdef SIGQUIT
{ SIGQUIT, "Quit" },
#endif
#ifdef SIGSAK
{ SIGSAK, "Secure Attention Key" },
#endif
#ifdef SIGSEGV
{ SIGSEGV, "Segmentation fault" },
#endif
#ifdef SIGSOUND
{ SIGSOUND, "HFT sound sequence completed" },
#endif
#ifdef SIGSTOP
{ SIGSTOP, "Suspended (signal)" },
#endif
#ifdef SIGSYS
{ SIGSYS, "Bad system call" },
#endif
#ifdef SIGTERM
{ SIGTERM, "Terminated" },
#endif
#ifdef SIGTRAP
{ SIGTRAP, "Trace/BPT trap" },
#endif
#ifdef SIGTSTP
{ SIGTSTP, "Suspended" },
#endif
#ifdef SIGTTIN
{ SIGTTIN, "Stopped (tty input)" },
#endif
#ifdef SIGTTOU
{ SIGTTOU, "Stopped (tty output)" },
#endif
#ifdef SIGURG
{ SIGURG, "Urgent I/O condition" },
#endif
#ifdef SIGUSR1
{ SIGUSR1, "User defined signal 1" },
#endif
#ifdef SIGUSR2
{ SIGUSR2, "User defined signal 2" },
#endif
#ifdef SIGVTALRM
{ SIGVTALRM, "Virtual timer expired" },
#endif
#ifdef SIGWINCH
{ SIGWINCH, "Window size changes" },
#endif
#ifdef SIGXCPU
{ SIGXCPU, "Cputime limit exceeded" },
#endif
#ifdef SIGXFSZ
{ SIGXFSZ, "Filesize limit exceeded" },
#endif
};
/*
* sigmsg --
* Return a pointer to a message describing a signal.
*/
static const char *
sigmsg(signo)
int signo;
{
static char buf[40];
const SIGS *sigp;
int n;
for (n = 0,
sigp = &sigs[0]; n < sizeof(sigs) / sizeof(sigs[0]); ++n, ++sigp)
if (sigp->number == signo)
return (sigp->message);
(void)snprintf(buf, sizeof(buf), "Unknown signal: %d", signo);
return (buf);
}
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