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Support Linux binfmt_misc and APE loading on Apple

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The "no modify self" variant of Actually Portable Executable is now
supported on all platforms. If you use `$(APE_NO_MODIFY_SELF)` then
ld.bfd will embed a 4096 byte ELF binary and a 4096 byte Macho file
which are installed on the fly to ${TMPDIR:-/tmp}, which enables us
launch the executable, without needing to copy the whole executable

To prevent it from copying a tiny executable to your temp directory
you need to install the `ape` command (renamed from ape-loader), to
a system path. For example:

    # FreeBSD / NetBSD / OpenBSD
    make -j8 o//ape/ape
    cp o//ape/ape /usr/bin/ape

    # Mac OS
    # make -j8 o//ape/ape.macho
    curl https://justine.lol/ape.macho >/usr/bin/ape
    chmod +x /usr/bin/ape

On Linux you can get even more performance with the new binfmt_misc
support which makes launching non-modifying APE binaries as fast as
launching ELF executables. Running the following command:

    # Linux
    ape/apeinstall.sh

Will copy APE loader to /usr/bin/ape and register with binfmt_misc
Lastly, this change also fixes a really interesting race condition
with OpenBSD thread joining.
This commit is contained in:
Justine Tunney 2022-05-21 07:52:58 -07:00
parent 7838edae88
commit db0d8dd806
31 changed files with 1089 additions and 305 deletions
Download patch file Download diff file Expand all files Collapse all files

24
test/libc/calls/execve_test.c
View file

@ -23,13 +23,7 @@
#include "libc/testlib/testlib.h"
void SetUp(void) {
if (getenv("_SUBPROCESS")) {
if (!__argv[0]) {
exit(0);
} else {
exit(7);
}
} else if (getenv("_WEIRDENV")) {
if (getenv("_WEIRDENV")) {
for (char **e = environ; *e; ++e) {
if (!strcmp(*e, "WEIRD")) {
exit(0);
@ -39,22 +33,6 @@ void SetUp(void) {
}
}
TEST(execve, testWeirdAnsiC89emptyArgv) {
char *prog;
int pid, ws;
if (IsWindows()) return;
if (IsOpenbsd()) return;
prog = GetProgramExecutableName();
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
execve(prog, (char *const[]){0}, (char *const[]){"_SUBPROCESS=1", 0});
_Exit(127);
}
ASSERT_NE(-1, wait(&ws));
EXPECT_TRUE(WIFEXITED(ws));
EXPECT_EQ(0, WEXITSTATUS(ws));
}
TEST(execve, testWeirdEnvironmentVariable) {
char *prog;
int pid, ws;