uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/build-support/libredirect/default.nix

@@ -0,0 +1,115 @@
+{ lib, stdenv, bintools-unwrapped, llvmPackages_13, coreutils }:
+
+if stdenv.hostPlatform.isStatic
+then throw ''
+  libredirect is not available on static builds.
+
+  Please fix your derivation to not depend on libredirect on static
+  builds, using something like following:
+
+    nativeBuildInputs =
+      lib.optional (!stdenv.buildPlatform.isStatic) libredirect;
+
+  and disable tests as necessary, although fixing tests to work without
+  libredirect is even better.
+
+  libredirect uses LD_PRELOAD feature of dynamic loader and does not
+  work on static builds where dynamic loader is not used.
+  ''
+else stdenv.mkDerivation rec {
+  pname = "libredirect";
+  version = "0";
+
+  unpackPhase = ''
+    cp ${./libredirect.c} libredirect.c
+    cp ${./test.c} test.c
+  '';
+
+  outputs = ["out" "hook"];
+
+  libName = "libredirect" + stdenv.targetPlatform.extensions.sharedLibrary;
+
+  buildPhase = ''
+    runHook preBuild
+
+    ${if stdenv.isDarwin && stdenv.isAarch64 then ''
+    # We need the unwrapped binutils and clang:
+    # We also want to build a fat library with x86_64, arm64, arm64e in there.
+    # Because we use the unwrapped tools, we need to provide -isystem for headers
+    # and the library search directory for libdl.
+    # We can't build this on x86_64, because the libSystem we point to doesn't
+    # like arm64(e).
+    PATH=${bintools-unwrapped}/bin:${llvmPackages_13.clang-unwrapped}/bin:$PATH \
+      clang -arch x86_64 -arch arm64 -arch arm64e \
+      -isystem ${llvmPackages_13.clang.libc}/include \
+      -isystem ${llvmPackages_13.libclang.lib}/lib/clang/*/include \
+      -L${llvmPackages_13.clang.libc}/lib \
+      -Wl,-install_name,$libName \
+      -Wall -std=c99 -O3 -fPIC libredirect.c \
+      -ldl -shared -o "$libName"
+    '' else if stdenv.isDarwin then ''
+    $CC -Wall -std=c99 -O3 -fPIC libredirect.c \
+      -Wl,-install_name,$out/lib/$libName \
+      -ldl -shared -o "$libName"
+    '' else ''
+    $CC -Wall -std=c99 -O3 -fPIC libredirect.c \
+      -ldl -shared -o "$libName"
+    ''}
+
+    if [ -n "$doInstallCheck" ]; then
+      $CC -Wall -std=c99 \
+        ${lib.optionalString (!stdenv.isDarwin) "-D_GNU_SOURCE"} \
+        -O3 test.c -o test
+    fi
+
+    runHook postBuild
+  '';
+
+  # We want to retain debugging info to be able to use GDB on libredirect.so
+  # to more easily investigate which function overrides are missing or why
+  # existing ones do not have the intended effect.
+  dontStrip = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    install -vD "$libName" "$out/lib/$libName"
+
+  '' + lib.optionalString (stdenv.isDarwin && stdenv.isAarch64) ''
+    # dylib will be rejected unless dylib rpath gets explictly set
+    install_name_tool \
+      -change $libName $out/lib/$libName \
+      $out/lib/$libName
+  '' + ''
+    # Provide a setup hook that injects our library into every process.
+    mkdir -p "$hook/nix-support"
+    cat <<SETUP_HOOK > "$hook/nix-support/setup-hook"
+    ${if stdenv.isDarwin then ''
+    export DYLD_INSERT_LIBRARIES="$out/lib/$libName"
+    '' else ''
+    export LD_PRELOAD="$out/lib/$libName"
+    ''}
+    SETUP_HOOK
+
+    runHook postInstall
+  '';
+
+  doInstallCheck = true;
+
+  installCheckPhase = ''
+    (
+      source "$hook/nix-support/setup-hook"
+      NIX_REDIRECTS="/foo/bar/test=${coreutils}/bin/true:/bar/baz=$(mktemp -d)" ./test
+    )
+  '';
+
+  meta = with lib; {
+    platforms = platforms.unix;
+    description = "An LD_PRELOAD library to intercept and rewrite the paths in glibc calls";
+    longDescription = ''
+      libredirect is an LD_PRELOAD library to intercept and rewrite the paths in
+      glibc calls based on the value of $NIX_REDIRECTS, a colon-separated list
+      of path prefixes to be rewritten, e.g. "/src=/dst:/usr/=/nix/store/".
+    '';
+  };
+}

pkgs/build-support/libredirect/libredirect.c

@@ -0,0 +1,477 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <string.h>
+#include <spawn.h>
+#include <dirent.h>
+
+#define MAX_REDIRECTS 128
+
+#ifdef __APPLE__
+  struct dyld_interpose {
+    const void * replacement;
+    const void * replacee;
+  };
+  #define WRAPPER(ret, name) static ret _libredirect_wrapper_##name
+  #define LOOKUP_REAL(name) &name
+  #define WRAPPER_DEF(name) \
+    __attribute__((used)) static struct dyld_interpose _libredirect_interpose_##name \
+      __attribute__((section("__DATA,__interpose"))) = { &_libredirect_wrapper_##name, &name };
+#else
+  #define WRAPPER(ret, name) ret name
+  #define LOOKUP_REAL(name) dlsym(RTLD_NEXT, #name)
+  #define WRAPPER_DEF(name)
+#endif
+
+static int nrRedirects = 0;
+static char * from[MAX_REDIRECTS];
+static char * to[MAX_REDIRECTS];
+
+static int isInitialized = 0;
+
+// FIXME: might run too late.
+static void init() __attribute__((constructor));
+
+static void init()
+{
+    if (isInitialized) return;
+
+    char * spec = getenv("NIX_REDIRECTS");
+    if (!spec) return;
+
+    // Ensure we only run this code once.
+    // We do not do `unsetenv("NIX_REDIRECTS")` to ensure that redirects
+    // also get initialized for subprocesses.
+    isInitialized = 1;
+
+    char * spec2 = malloc(strlen(spec) + 1);
+    strcpy(spec2, spec);
+
+    char * pos = spec2, * eq;
+    while ((eq = strchr(pos, '='))) {
+        *eq = 0;
+        from[nrRedirects] = pos;
+        pos = eq + 1;
+        to[nrRedirects] = pos;
+        nrRedirects++;
+        if (nrRedirects == MAX_REDIRECTS) break;
+        char * end = strchr(pos, ':');
+        if (!end) break;
+        *end = 0;
+        pos = end + 1;
+    }
+
+}
+
+static const char * rewrite(const char * path, char * buf)
+{
+    if (path == NULL) return path;
+    for (int n = 0; n < nrRedirects; ++n) {
+        int len = strlen(from[n]);
+        if (strncmp(path, from[n], len) != 0) continue;
+        if (snprintf(buf, PATH_MAX, "%s%s", to[n], path + len) >= PATH_MAX)
+            abort();
+        return buf;
+    }
+
+    return path;
+}
+
+static char * rewrite_non_const(char * path, char * buf)
+{
+    // as long as the argument `path` is non-const, we can consider discarding
+    // the const qualifier of the return value to be safe.
+    return (char *)rewrite(path, buf);
+}
+
+static int open_needs_mode(int flags)
+{
+#ifdef O_TMPFILE
+    return (flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE;
+#else
+    return flags & O_CREAT;
+#endif
+}
+
+/* The following set of Glibc library functions is very incomplete -
+   it contains only what we needed for programs in Nixpkgs. Just add
+   more functions as needed. */
+
+WRAPPER(int, open)(const char * path, int flags, ...)
+{
+    int (*open_real) (const char *, int, mode_t) = LOOKUP_REAL(open);
+    mode_t mode = 0;
+    if (open_needs_mode(flags)) {
+        va_list ap;
+        va_start(ap, flags);
+        mode = va_arg(ap, mode_t);
+        va_end(ap);
+    }
+    char buf[PATH_MAX];
+    return open_real(rewrite(path, buf), flags, mode);
+}
+WRAPPER_DEF(open)
+
+// In musl libc, open64 is simply a macro for open
+#if !defined(__APPLE__) && !defined(open64)
+WRAPPER(int, open64)(const char * path, int flags, ...)
+{
+    int (*open64_real) (const char *, int, mode_t) = LOOKUP_REAL(open64);
+    mode_t mode = 0;
+    if (open_needs_mode(flags)) {
+        va_list ap;
+        va_start(ap, flags);
+        mode = va_arg(ap, mode_t);
+        va_end(ap);
+    }
+    char buf[PATH_MAX];
+    return open64_real(rewrite(path, buf), flags, mode);
+}
+WRAPPER_DEF(open64)
+#endif
+
+WRAPPER(int, openat)(int dirfd, const char * path, int flags, ...)
+{
+    int (*openat_real) (int, const char *, int, mode_t) = LOOKUP_REAL(openat);
+    mode_t mode = 0;
+    if (open_needs_mode(flags)) {
+        va_list ap;
+        va_start(ap, flags);
+        mode = va_arg(ap, mode_t);
+        va_end(ap);
+    }
+    char buf[PATH_MAX];
+    return openat_real(dirfd, rewrite(path, buf), flags, mode);
+}
+WRAPPER_DEF(openat)
+
+WRAPPER(FILE *, fopen)(const char * path, const char * mode)
+{
+    FILE * (*fopen_real) (const char *, const char *) = LOOKUP_REAL(fopen);
+    char buf[PATH_MAX];
+    return fopen_real(rewrite(path, buf), mode);
+}
+WRAPPER_DEF(fopen)
+
+#ifdef __GLIBC__
+WRAPPER(FILE *, __nss_files_fopen)(const char * path)
+{
+    FILE * (*__nss_files_fopen_real) (const char *) = LOOKUP_REAL(__nss_files_fopen);
+    char buf[PATH_MAX];
+    return __nss_files_fopen_real(rewrite(path, buf));
+}
+WRAPPER_DEF(__nss_files_fopen)
+#endif
+
+// In musl libc, fopen64 is simply a macro for fopen
+#if !defined(__APPLE__) && !defined(fopen64)
+WRAPPER(FILE *, fopen64)(const char * path, const char * mode)
+{
+    FILE * (*fopen64_real) (const char *, const char *) = LOOKUP_REAL(fopen64);
+    char buf[PATH_MAX];
+    return fopen64_real(rewrite(path, buf), mode);
+}
+WRAPPER_DEF(fopen64)
+#endif
+
+#ifdef __linux__
+WRAPPER(int, __xstat)(int ver, const char * path, struct stat * st)
+{
+    int (*__xstat_real) (int ver, const char *, struct stat *) = LOOKUP_REAL(__xstat);
+    char buf[PATH_MAX];
+    return __xstat_real(ver, rewrite(path, buf), st);
+}
+WRAPPER_DEF(__xstat)
+#endif
+
+#ifdef __linux__
+WRAPPER(int, __xstat64)(int ver, const char * path, struct stat64 * st)
+{
+    int (*__xstat64_real) (int ver, const char *, struct stat64 *) = LOOKUP_REAL(__xstat64);
+    char buf[PATH_MAX];
+    return __xstat64_real(ver, rewrite(path, buf), st);
+}
+WRAPPER_DEF(__xstat64)
+#endif
+
+WRAPPER(int, stat)(const char * path, struct stat * st)
+{
+    int (*__stat_real) (const char *, struct stat *) = LOOKUP_REAL(stat);
+    char buf[PATH_MAX];
+    return __stat_real(rewrite(path, buf), st);
+}
+WRAPPER_DEF(stat)
+
+WRAPPER(int, access)(const char * path, int mode)
+{
+    int (*access_real) (const char *, int mode) = LOOKUP_REAL(access);
+    char buf[PATH_MAX];
+    return access_real(rewrite(path, buf), mode);
+}
+WRAPPER_DEF(access)
+
+WRAPPER(int, posix_spawn)(pid_t * pid, const char * path,
+    const posix_spawn_file_actions_t * file_actions,
+    const posix_spawnattr_t * attrp,
+    char * const argv[], char * const envp[])
+{
+    int (*posix_spawn_real) (pid_t *, const char *,
+        const posix_spawn_file_actions_t *,
+        const posix_spawnattr_t *,
+        char * const argv[], char * const envp[]) = LOOKUP_REAL(posix_spawn);
+    char buf[PATH_MAX];
+    return posix_spawn_real(pid, rewrite(path, buf), file_actions, attrp, argv, envp);
+}
+WRAPPER_DEF(posix_spawn)
+
+WRAPPER(int, posix_spawnp)(pid_t * pid, const char * file,
+    const posix_spawn_file_actions_t * file_actions,
+    const posix_spawnattr_t * attrp,
+    char * const argv[], char * const envp[])
+{
+    int (*posix_spawnp_real) (pid_t *, const char *,
+        const posix_spawn_file_actions_t *,
+        const posix_spawnattr_t *,
+        char * const argv[], char * const envp[]) = LOOKUP_REAL(posix_spawnp);
+    char buf[PATH_MAX];
+    return posix_spawnp_real(pid, rewrite(file, buf), file_actions, attrp, argv, envp);
+}
+WRAPPER_DEF(posix_spawnp)
+
+WRAPPER(int, execv)(const char * path, char * const argv[])
+{
+    int (*execv_real) (const char * path, char * const argv[]) = LOOKUP_REAL(execv);
+    char buf[PATH_MAX];
+    return execv_real(rewrite(path, buf), argv);
+}
+WRAPPER_DEF(execv)
+
+WRAPPER(int, execvp)(const char * path, char * const argv[])
+{
+    int (*_execvp) (const char *, char * const argv[]) = LOOKUP_REAL(execvp);
+    char buf[PATH_MAX];
+    return _execvp(rewrite(path, buf), argv);
+}
+WRAPPER_DEF(execvp)
+
+WRAPPER(int, execve)(const char * path, char * const argv[], char * const envp[])
+{
+    int (*_execve) (const char *, char * const argv[], char * const envp[]) = LOOKUP_REAL(execve);
+    char buf[PATH_MAX];
+    return _execve(rewrite(path, buf), argv, envp);
+}
+WRAPPER_DEF(execve)
+
+WRAPPER(DIR *, opendir)(const char * path)
+{
+    char buf[PATH_MAX];
+    DIR * (*_opendir) (const char*) = LOOKUP_REAL(opendir);
+
+    return _opendir(rewrite(path, buf));
+}
+WRAPPER_DEF(opendir)
+
+#define SYSTEM_CMD_MAX 512
+
+static char * replace_substring(char * source, char * buf, char * replace_string, char * start_ptr, char * suffix_ptr) {
+    char head[SYSTEM_CMD_MAX] = {0};
+    strncpy(head, source, start_ptr - source);
+
+    char tail[SYSTEM_CMD_MAX] = {0};
+    if(suffix_ptr < source + strlen(source)) {
+       strcpy(tail, suffix_ptr);
+    }
+
+    sprintf(buf, "%s%s%s", head, replace_string, tail);
+    return buf;
+}
+
+static char * replace_string(char * buf, char * from, char * to) {
+    int num_matches = 0;
+    char * matches[SYSTEM_CMD_MAX];
+    int from_len = strlen(from);
+    for(int i=0; i<strlen(buf); i++){
+       char *cmp_start = buf + i;
+       if(strncmp(from, cmp_start, from_len) == 0){
+          matches[num_matches] = cmp_start;
+          num_matches++;
+       }
+    }
+    int len_diff = strlen(to) - strlen(from);
+    for(int n = 0; n < num_matches; n++) {
+       char replaced[SYSTEM_CMD_MAX];
+       replace_substring(buf, replaced, to, matches[n], matches[n]+from_len);
+       strcpy(buf, replaced);
+       for(int nn = n+1; nn < num_matches; nn++) {
+          matches[nn] += len_diff;
+       }
+    }
+    return buf;
+}
+
+static void rewriteSystemCall(const char * command, char * buf) {
+    char * p = buf;
+
+    #ifdef __APPLE__
+    // The dyld environment variable is not inherited by the subprocess spawned
+    // by system(), so this hack redefines it.
+    Dl_info info;
+    dladdr(&rewriteSystemCall, &info);
+    p = stpcpy(p, "export DYLD_INSERT_LIBRARIES=");
+    p = stpcpy(p, info.dli_fname);
+    p = stpcpy(p, ";");
+    #endif
+
+    stpcpy(p, command);
+
+    for (int n = 0; n < nrRedirects; ++n) {
+       replace_string(buf, from[n], to[n]);
+    }
+}
+
+WRAPPER(int, system)(const char *command)
+{
+    int (*_system) (const char*) = LOOKUP_REAL(system);
+
+    char newCommand[SYSTEM_CMD_MAX];
+    rewriteSystemCall(command, newCommand);
+    return _system(newCommand);
+}
+WRAPPER_DEF(system)
+
+WRAPPER(int, mkdir)(const char *path, mode_t mode)
+{
+    int (*mkdir_real) (const char *path, mode_t mode) = LOOKUP_REAL(mkdir);
+    char buf[PATH_MAX];
+    return mkdir_real(rewrite(path, buf), mode);
+}
+WRAPPER_DEF(mkdir)
+
+WRAPPER(int, mkdirat)(int dirfd, const char *path, mode_t mode)
+{
+    int (*mkdirat_real) (int dirfd, const char *path, mode_t mode) = LOOKUP_REAL(mkdirat);
+    char buf[PATH_MAX];
+    return mkdirat_real(dirfd, rewrite(path, buf), mode);
+}
+WRAPPER_DEF(mkdirat)
+
+WRAPPER(int, unlink)(const char *path)
+{
+    int (*unlink_real) (const char *path) = LOOKUP_REAL(unlink);
+    char buf[PATH_MAX];
+    return unlink_real(rewrite(path, buf));
+}
+WRAPPER_DEF(unlink)
+
+WRAPPER(int, unlinkat)(int dirfd, const char *path, int flags)
+{
+    int (*unlinkat_real) (int dirfd, const char *path, int flags) = LOOKUP_REAL(unlinkat);
+    char buf[PATH_MAX];
+    return unlinkat_real(dirfd, rewrite(path, buf), flags);
+}
+WRAPPER_DEF(unlinkat)
+
+WRAPPER(int, rmdir)(const char *path)
+{
+    int (*rmdir_real) (const char *path) = LOOKUP_REAL(rmdir);
+    char buf[PATH_MAX];
+    return rmdir_real(rewrite(path, buf));
+}
+WRAPPER_DEF(rmdir)
+
+static void copy_temp_wildcard(char * dest, char * src, int suffixlen) {
+    int dest_len = strnlen(dest, PATH_MAX);
+    int src_len = strnlen(src, PATH_MAX);
+    memcpy(dest + dest_len - (6 + suffixlen), src + src_len - (6 + suffixlen), 6);
+}
+
+WRAPPER(int, mkstemp)(char *template)
+{
+    int (*mkstemp_real) (char *template) = LOOKUP_REAL(mkstemp);
+    char buf[PATH_MAX];
+    char * rewritten = rewrite_non_const(template, buf);
+    int retval = mkstemp_real(rewritten);
+    if (retval >= 0 && rewritten != template) {
+        copy_temp_wildcard(template, rewritten, 0);
+    }
+    return retval;
+}
+WRAPPER_DEF(mkstemp)
+
+WRAPPER(int, mkostemp)(char *template, int flags)
+{
+    int (*mkostemp_real) (char *template, int flags) = LOOKUP_REAL(mkostemp);
+    char buf[PATH_MAX];
+    char * rewritten = rewrite_non_const(template, buf);
+    int retval = mkostemp_real(rewritten, flags);
+    if (retval >= 0 && rewritten != template) {
+        copy_temp_wildcard(template, rewritten, 0);
+    }
+    return retval;
+}
+WRAPPER_DEF(mkostemp)
+
+WRAPPER(int, mkstemps)(char *template, int suffixlen)
+{
+    int (*mkstemps_real) (char *template, int suffixlen) = LOOKUP_REAL(mkstemps);
+    char buf[PATH_MAX];
+    char * rewritten = rewrite_non_const(template, buf);
+    int retval = mkstemps_real(rewritten, suffixlen);
+    if (retval >= 0 && rewritten != template) {
+        copy_temp_wildcard(template, rewritten, suffixlen);
+    }
+    return retval;
+}
+WRAPPER_DEF(mkstemps)
+
+WRAPPER(int, mkostemps)(char *template, int suffixlen, int flags)
+{
+    int (*mkostemps_real) (char *template, int suffixlen, int flags) = LOOKUP_REAL(mkostemps);
+    char buf[PATH_MAX];
+    char * rewritten = rewrite_non_const(template, buf);
+    int retval = mkostemps_real(rewritten, suffixlen, flags);
+    if (retval >= 0 && rewritten != template) {
+        copy_temp_wildcard(template, rewritten, suffixlen);
+    }
+    return retval;
+}
+WRAPPER_DEF(mkostemps)
+
+WRAPPER(char *, mkdtemp)(char *template)
+{
+    char * (*mkdtemp_real) (char *template) = LOOKUP_REAL(mkdtemp);
+    char buf[PATH_MAX];
+    char * rewritten = rewrite_non_const(template, buf);
+    char * retval = mkdtemp_real(rewritten);
+    if (retval == NULL) {
+        return retval;
+    };
+    if (rewritten != template) {
+        copy_temp_wildcard(template, rewritten, 0);
+    }
+    return template;
+}
+WRAPPER_DEF(mkdtemp)
+
+WRAPPER(char *, mktemp)(char *template)
+{
+    char * (*mktemp_real) (char *template) = LOOKUP_REAL(mktemp);
+    char buf[PATH_MAX];
+    char * rewritten = rewrite_non_const(template, buf);
+    char * retval = mktemp_real(rewritten);
+    if (retval == NULL) {
+        return retval;
+    };
+    if (rewritten != template) {
+        copy_temp_wildcard(template, rewritten, 0);
+    }
+    return template;
+}
+WRAPPER_DEF(mktemp)

pkgs/build-support/libredirect/test.c

@@ -0,0 +1,144 @@
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <spawn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#define TESTDIR "/bar/baz"
+#define TESTPATH "/foo/bar/test"
+#define SUBTEST "./test sub"
+
+extern char **environ;
+
+void test_spawn(void) {
+    pid_t pid;
+    int ret;
+    posix_spawn_file_actions_t file_actions;
+    char *argv[] = {"true", NULL};
+
+    assert(posix_spawn_file_actions_init(&file_actions) == 0);
+
+    ret = posix_spawn(&pid, TESTPATH, &file_actions, NULL, argv, environ);
+
+    assert(ret == 0);
+    assert(waitpid(pid, NULL, 0) != -1);
+}
+
+void test_execv(void) {
+    char *argv[] = {"true", NULL};
+    assert(execv(TESTPATH, argv) == 0);
+}
+
+void test_system(void) {
+    assert(system(TESTPATH) == 0);
+}
+
+void test_subprocess(void) {
+    assert(system(SUBTEST) == 0);
+}
+
+void assert_mktemp_path(
+    const char * orig_prefix,
+    const char * orig_suffix,
+    const char * updated
+) {
+    // prefix unchanged
+    assert(strncmp(updated, orig_prefix, strlen(orig_prefix)) == 0);
+    // wildcards replaced
+    assert(strcmp(updated + strlen(orig_prefix), "XXXXXX") != 0);
+    // suffix unchanged
+    assert(strcmp(updated + strlen(orig_prefix) + 6, orig_suffix) == 0);
+}
+
+int main(int argc, char *argv[])
+{
+    FILE *testfp;
+    int testfd;
+    struct stat testsb;
+    char buf[PATH_MAX];
+
+    testfp = fopen(TESTPATH, "r");
+    assert(testfp != NULL);
+    fclose(testfp);
+
+    testfd = open(TESTPATH, O_RDONLY);
+    assert(testfd != -1);
+    close(testfd);
+
+    assert(access(TESTPATH, X_OK) == 0);
+
+    assert(stat(TESTPATH, &testsb) != -1);
+
+    assert(mkdir(TESTDIR "/dir-mkdir", 0777) == 0);
+    assert(unlink(TESTDIR "/dir-mkdir") == -1); // it's a directory!
+#ifndef __APPLE__
+    assert(errno == EISDIR);
+#endif
+    assert(rmdir(TESTDIR "/dir-mkdir") == 0);
+    assert(unlink(TESTDIR "/dir-mkdir") == -1);
+    assert(errno == ENOENT);
+
+    assert(mkdirat(123, TESTDIR "/dir-mkdirat", 0777) == 0);
+    assert(unlinkat(123, TESTDIR "/dir-mkdirat", 0) == -1); // it's a directory!
+#ifndef __APPLE__
+    assert(errno == EISDIR);
+#endif
+    assert(unlinkat(123, TESTDIR "/dir-mkdirat", AT_REMOVEDIR) == 0);
+
+    strncpy(buf, TESTDIR "/tempXXXXXX", PATH_MAX);
+    testfd = mkstemp(buf);
+    assert(testfd > 0);
+    assert_mktemp_path(TESTDIR "/temp", "", buf);
+    close(testfd);
+
+    strncpy(buf, TESTDIR "/tempXXXXXX", PATH_MAX);
+    testfd = mkostemp(buf, 0);
+    assert(testfd > 0);
+    assert_mktemp_path(TESTDIR "/temp", "", buf);
+    close(testfd);
+
+    strncpy(buf, TESTDIR "/tempXXXXXX.test", PATH_MAX);
+    testfd = mkstemps(buf, strlen(".test"));
+    assert(testfd > 0);
+    assert_mktemp_path(TESTDIR "/temp", ".test", buf);
+    close(testfd);
+
+    strncpy(buf, TESTDIR "/tempXXXXXX.test", PATH_MAX);
+    testfd = mkostemps(buf, strlen(".test"), 0);
+    assert(testfd > 0);
+    assert_mktemp_path(TESTDIR "/temp", ".test", buf);
+    close(testfd);
+
+    strncpy(buf, TESTDIR "/tempXXXXXX", PATH_MAX);
+    assert(mkdtemp(buf) == buf);
+    assert_mktemp_path(TESTDIR "/temp", "", buf);
+
+    strncpy(buf, TESTDIR "/tempXXXXXX", PATH_MAX);
+    assert(mktemp(buf) == buf);
+    assert_mktemp_path(TESTDIR "/temp", "", buf);
+
+    test_spawn();
+    test_system();
+
+    // Only run subprocess if no arguments are given
+    // as the subprocess will be called without argument
+    // otherwise we will have infinite recursion
+    if (argc == 1) {
+        test_subprocess();
+    }
+
+    test_execv();
+
+    /* If all goes well, this is never reached because test_execv() replaces
+     * the current process.
+     */
+    return 0;
+}