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#!/bin/sh
set -eu
ROOT=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
SYNC_BIN=${SYNC_BIN:-"$ROOT/out/sync"}
CC=${CC:-cc}
TMPDIR=${TMPDIR:-/tmp}
WORKDIR=$(mktemp -d "$TMPDIR/sync-test.XXXXXX")
HOOK_C="$WORKDIR/sync-hook.c"
HOOK_SO="$WORKDIR/sync-hook.so"
STDOUT_FILE="$WORKDIR/stdout"
STDERR_FILE="$WORKDIR/stderr"
SYNC_MARKER="$WORKDIR/sync-marker"
trap 'rm -rf "$WORKDIR"' EXIT INT TERM
export LC_ALL=C
fail() {
printf '%s\n' "FAIL: $1" >&2
exit 1
}
assert_eq() {
name=$1
expected=$2
actual=$3
if [ "$expected" != "$actual" ]; then
printf '%s\n' "FAIL: $name" >&2
printf '%s\n' "--- expected ---" >&2
printf '%s' "$expected" >&2
printf '\n%s\n' "--- actual ---" >&2
printf '%s' "$actual" >&2
printf '\n' >&2
exit 1
fi
}
assert_empty() {
name=$1
text=$2
if [ -n "$text" ]; then
printf '%s\n' "FAIL: $name" >&2
printf '%s\n' "--- expected empty ---" >&2
printf '%s\n' "--- actual ---" >&2
printf '%s' "$text" >&2
printf '\n' >&2
exit 1
fi
}
assert_status() {
name=$1
expected=$2
actual=$3
if [ "$expected" -ne "$actual" ]; then
printf '%s\n' "FAIL: $name" >&2
printf '%s\n' "expected status: $expected" >&2
printf '%s\n' "actual status: $actual" >&2
exit 1
fi
}
run_capture() {
if "$@" >"$STDOUT_FILE" 2>"$STDERR_FILE"; then
LAST_STATUS=0
else
LAST_STATUS=$?
fi
LAST_STDOUT=$(cat "$STDOUT_FILE")
LAST_STDERR=$(cat "$STDERR_FILE")
}
build_sync_hook() {
cat >"$HOOK_C" <<'EOF'
#define _GNU_SOURCE 1
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
typedef void (*sync_fn_t)(void);
static void
write_marker(const char *path)
{
static const char marker[] = "sync-called\n";
size_t offset;
int fd;
if (path == NULL || path[0] == '\0')
return;
fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0600);
if (fd < 0)
return;
offset = 0;
while (offset < sizeof(marker) - 1) {
ssize_t written;
written = write(fd, marker + offset, sizeof(marker) - 1 - offset);
if (written < 0) {
if (errno == EINTR)
continue;
break;
}
offset += (size_t)written;
}
(void)close(fd);
}
void
sync(void)
{
static sync_fn_t real_sync;
static int resolved;
if (!resolved) {
real_sync = (sync_fn_t)dlsym(RTLD_NEXT, "sync");
resolved = 1;
}
write_marker(getenv("SYNC_HOOK_OUTPUT"));
if (real_sync != NULL)
real_sync();
}
EOF
"$CC" -shared -fPIC -O2 -std=c17 -Wall -Wextra -Werror \
"$HOOK_C" -o "$HOOK_SO" -ldl || fail "failed to build sync hook with $CC"
}
[ -x "$SYNC_BIN" ] || fail "missing binary: $SYNC_BIN"
build_sync_hook
run_capture "$SYNC_BIN"
assert_status "sync status" 0 "$LAST_STATUS"
assert_empty "sync stdout" "$LAST_STDOUT"
assert_empty "sync stderr" "$LAST_STDERR"
run_capture "$SYNC_BIN" unexpected
assert_status "operand status" 1 "$LAST_STATUS"
assert_empty "operand stdout" "$LAST_STDOUT"
assert_eq "operand stderr" \
"sync: unexpected argument: unexpected
usage: sync" \
"$LAST_STDERR"
run_capture "$SYNC_BIN" --
assert_status "double dash status" 1 "$LAST_STATUS"
assert_empty "double dash stdout" "$LAST_STDOUT"
assert_eq "double dash stderr" \
"sync: unexpected argument: --
usage: sync" \
"$LAST_STDERR"
run_capture "$SYNC_BIN" first second
assert_status "too many args status" 1 "$LAST_STATUS"
assert_empty "too many args stdout" "$LAST_STDOUT"
assert_eq "too many args stderr" \
"sync: unexpected argument: first
usage: sync" \
"$LAST_STDERR"
rm -f "$SYNC_MARKER"
run_capture env LD_PRELOAD="$HOOK_SO" SYNC_HOOK_OUTPUT="$SYNC_MARKER" "$SYNC_BIN"
assert_status "hooked sync status" 0 "$LAST_STATUS"
assert_empty "hooked sync stdout" "$LAST_STDOUT"
assert_empty "hooked sync stderr" "$LAST_STDERR"
[ -f "$SYNC_MARKER" ] || fail "sync() was not invoked"
assert_eq "hook marker" "sync-called" "$(cat "$SYNC_MARKER")"
rm -f "$SYNC_MARKER"
run_capture env LD_PRELOAD="$HOOK_SO" SYNC_HOOK_OUTPUT="$SYNC_MARKER" \
"$SYNC_BIN" unexpected
assert_status "hooked invalid status" 1 "$LAST_STATUS"
assert_empty "hooked invalid stdout" "$LAST_STDOUT"
assert_eq "hooked invalid stderr" \
"sync: unexpected argument: unexpected
usage: sync" \
"$LAST_STDERR"
[ ! -e "$SYNC_MARKER" ] || fail "sync() ran on invalid arguments"
printf '%s\n' "PASS"
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