testing execve

.gitignore

*.o
execve
execv

# autoconf
.deps
Makefile
Makefile.in
aclocal.m4
*.cache
compile
config.*
configure
depcomp
install-sh
missing
stamp-h1

configure.ac

AC_INIT([hraban], [1.0], [[email protected]])
AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AC_PROG_CC
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile])
AC_OUTPUT

default.nix

{ pkgs ? import <nixpkgs> {} }:

pkgs.stdenv.mkDerivation {
  name = "execvetest";
  src = ./.;
  postPatch = ''
    sed -i -e 's@/usr/bin/env@${pkgs.coreutils}/bin/env@' *.c
  '';
  nativeBuildInputs = [ pkgs.autoreconfHook ];
  doCheck = true;
}

execv.c

#include <stdio.h>
#include <unistd.h>

#include <CoreFoundation/CoreFoundation.h>

extern char **environ;

int
main(int argc, char *argv[])
{
  CFStringRef myCFString = CFStringCreateWithCString(kCFAllocatorDefault, "testing execv:\n", kCFStringEncodingUTF8);
  CFShow(myCFString);

  char *eargv[] = {"env", NULL};
  char *eenv[] = {"foo=bar", NULL};
  environ = eenv;
  execv("/usr/bin/env", eargv);
  return -1;
}

execve.c

#include <stdio.h>
#include <unistd.h>

#include <CoreFoundation/CoreFoundation.h>

int
main(int argc, char *argv[])
{
  CFStringRef myCFString = CFStringCreateWithCString(kCFAllocatorDefault, "testing execve:\n", kCFStringEncodingUTF8);
  CFShow(myCFString);

  char *eargv[] = {"env", NULL};
  char *eenv[] = {"foo=bar", NULL};
  execve("/usr/bin/env", eargv, eenv);
  return -1;
}

execvp.c

#include <stdio.h>
#include <unistd.h>

#include <CoreFoundation/CoreFoundation.h>

extern char **environ;

int
main(int argc, char *argv[])
{
  CFStringRef myCFString = CFStringCreateWithCString(kCFAllocatorDefault, "testing execvp:\n", kCFStringEncodingUTF8);
  CFShow(myCFString);

  char *eargv[] = {"env", NULL};
  char *eenv[] = {"foo=bar", NULL};
  environ = eenv;
  execvp("env", eargv);
  return -1;
}

Makefile.am

bin_PROGRAMS = execve execv execvp
execve_SOURCES = execve.c
execv_SOURCES = execv.c

AM_CFLAGS = -Wall -pedantic -std=c23
AM_LDFLAGS = -F/System/Library/Frameworks -framework CoreServices

.PHONY: check
check: $(bin_PROGRAMS)
	for f in $(bin_PROGRAMS) ; do [[ "$$(./$$f)" == "foo=bar" ]]; done