view toys/posix/env.c @ 1048:e3ebec880fe6 draft

env - there were 2 segfaults when run on my Ubuntu 12.04 machine: - one is because eglibc sets environ to NULL on clearenv(). I added check for environ being not NULL when iterating over environment variables - switched xexec to xexec_optargs because command argument is a pointer to optarg which is freed by xexec.
author Jacek Bukarewicz <>
date Thu, 05 Sep 2013 04:58:06 -0500
parents 786841fdb1e0
children 49c851da3658
line wrap: on
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/* env.c - Set the environment for command invocation.
 * Copyright 2012 Tryn Mirell <>


config ENV
  bool "env"
  default y
    usage: env [-i] [NAME=VALUE...] [command [option...]]

    Set the environment for command invocation.

    -i	Clear existing environment.

#include "toys.h"

extern char **environ;

void env_main(void)
  char **ev;
  char **command = NULL;
  char *del = "=";

  if (toys.optflags) clearenv();

  for (ev = toys.optargs; *ev != NULL; ev++) {
    char *env, *val = NULL;

    env = strtok(*ev, del);

    if (env) val = strtok(NULL, del);

    if (val) setenv(env, val, 1);
    else {
      command = ev;

  if (!command) {
    char **ep;
    if (environ) for (ep = environ; *ep; ep++) xputs(*ep);
  } else xexec_optargs(command - toys.optargs);