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static char rcsid[] = "$Id: system.c,v 1.2 2003/11/13 05:17:39 golda Exp $";
/*
* system.c - system(3) routines for Essence system.
*
* Darren Hardy, hardy@cs.colorado.edu, February 1994
*
* ----------------------------------------------------------------------
* Copyright (c) 1994, 1995. All rights reserved.
*
* Mic Bowman of Transarc Corporation.
* Peter Danzig of the University of Southern California.
* Darren R. Hardy of the University of Colorado at Boulder.
* Udi Manber of the University of Arizona.
* Michael F. Schwartz of the University of Colorado at Boulder.
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#include <fcntl.h>
#include "util.h"
#ifdef HAVE_SETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include <stdlib.h>
#include <string.h>
static void redirect_stdout();
/*
* do_system() - calls system(3).
*/
int do_system(cmd)
char *cmd;
{
#ifdef DEBUG
glimpselog("RUNNING as shell: %s\n", cmd);
#endif
return (system(cmd));
}
/*
* run_cmd() - simplified system(3). Parses the command, will redirect
* stdout and then fork/exec() to save a sh process.
*/
int run_cmd(cmd)
char *cmd;
{
int pid, status = 0;
#ifdef DEBUG
glimpselog("RUNNING: %s\n", cmd);
#endif
/*
** PURFIY:
** use fork() here instead of vfork(). With vfork parent and child
** share memory space. In the child we strdup a bunch of argv's
** which would otherwise never get free'd causing a memory leak in
** the parent.
*/
if ((pid = fork()) < 0) {
log_errno("run_cmd: fork");
return (1);
}
if (pid == 0) { /* child */
char *argv[64], buf[BUFSIZ];
int i;
memset(argv, '\0', sizeof(char *) * 64);
parse_argv(argv, cmd);
for (i = 0; argv[i] != NULL; i++) {
if (argv[i][0] == '>' && argv[i + 1] != NULL) {
argv[i] = NULL;
redirect_stdout(argv[++i]);
break;
}
}
execvp(argv[0], argv);
sprintf(buf, "execvp: %s", argv[0]);
log_errno(buf);
_exit(1);
}
/* parent */
(void) waitpid(pid, &status, (int) NULL);
return (WEXITSTATUS(status));
}
static void redirect_stdout(filename)
char *filename;
{
int fd;
if (filename == NULL)
return;
if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0644)) < 0) {
log_errno(filename);
return;
}
close(1);
dup2(fd, 1); /* make stdout */
}
static int dsl_pid = -1;
static void alarm_handler()
{
#ifdef DEBUG
glimpselog("do_system_lifetime: Caught signal. Killing %d.\n", dsl_pid);
#endif
(void) kill(dsl_pid, SIGTERM);
sleep(1);
(void) kill(dsl_pid, SIGKILL);
}
/*
* do_system_lifetime() - calls system(3). Only lives for lifetime seconds.
*/
void do_system_lifetime(cmd, lifetime)
char *cmd;
int lifetime;
{
#ifdef DEBUG
glimpselog("RUNNING: %s\n", cmd);
glimpselog("do_system_lifetime: Lifetime is %d seconds.\n", lifetime);
#endif
signal(SIGALRM, alarm_handler);
alarm(lifetime);
/*
** PURFIY:
** use fork() here instead of vfork(). With vfork parent and child
** share memory space. In the child we strdup a bunch of argv's
** which would otherwise never get free'd causing a memory leak in
** the parent.
*/
if ((dsl_pid = fork()) < 0) {
log_errno("fork");
return;
}
if (dsl_pid) { /* parent */
(void) waitpid(dsl_pid, (int *) NULL, (int) NULL);
alarm(0);
return;
} else { /* child */
char *argv[64];
char buf[BUFSIZ], i;
alarm(0);
memset(argv, '\0', sizeof(char *) * 64);
parse_argv(argv, cmd);
for (i = 0; argv[i] != NULL; i++) {
if (argv[i][0] == '>' && argv[i + 1] != NULL) {
argv[i] = NULL;
redirect_stdout(argv[++i]);
break;
}
}
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CPU)
{
struct rlimit rlp;
rlp.rlim_cur = rlp.rlim_max = lifetime;
(void) setrlimit(RLIMIT_CPU, &rlp);
}
#endif
execvp(argv[0], argv);
sprintf(buf, "execvp: %s", argv[0]);
log_errno(buf);
_exit(1);
}
}
/*
* close_all_fds() - closes all of the file descriptors starting with start.
*/
void close_all_fds(start)
int start;
{
int i;
#if defined(HAVE_GETDTABLESIZE)
for (i = start; i < getdtablesize(); i++) {
#elif defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
for (i = start; i < sysconf(_SC_OPEN_MAX); i++) {
#elif defined(OPEN_MAX)
for (i = start; i < OPEN_MAX; i++) {
#else
for (i = start; i < 64; i++) {
#endif
(void) close(i);
}
}
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