Merging upstream version 1.46.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 386 deletions

diff --git a/spawn/spawn_server.c b/spawn/spawn_server.c
deleted file mode 100644
index 1d79ef15d..000000000
--- a/spawn/spawn_server.c
+++ /dev/null
@@ -1,386 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#include "spawn.h"
-
-static uv_loop_t *loop;
-static uv_pipe_t server_pipe;
-
-static int server_shutdown = 0;
-
-static uv_thread_t thread;
-
-/* spawn outstanding execution structure */
-static avl_tree_lock spawn_outstanding_exec_tree;
-
-static char prot_buffer[MAX_COMMAND_LENGTH];
-static unsigned prot_buffer_len = 0;
-
-struct spawn_execution_info {
-    avl_t avl;
-
-    void *handle;
-    int exit_status;
-    pid_t pid;
-    struct spawn_execution_info *next;
-};
-
-int spawn_exec_compare(void *a, void *b)
-{
-    struct spawn_execution_info *spwna = a, *spwnb = b;
-
-    if (spwna->pid < spwnb->pid) return -1;
-    if (spwna->pid > spwnb->pid) return 1;
-
-    return 0;
-}
-
-/* wake up waiter thread to reap the spawned processes */
-static uv_mutex_t wait_children_mutex;
-static uv_cond_t wait_children_cond;
-static uint8_t spawned_processes;
-static struct spawn_execution_info *child_waited_list;
-static uv_async_t child_waited_async;
-
-static inline struct spawn_execution_info *dequeue_child_waited_list(void)
-{
-    struct spawn_execution_info *exec_info;
-
-    uv_mutex_lock(&wait_children_mutex);
-    if (NULL == child_waited_list) {
-        exec_info = NULL;
-    } else {
-        exec_info = child_waited_list;
-        child_waited_list = exec_info->next;
-    }
-    uv_mutex_unlock(&wait_children_mutex);
-
-    return exec_info;
-}
-
-static inline void enqueue_child_waited_list(struct spawn_execution_info *exec_info)
-{
-    uv_mutex_lock(&wait_children_mutex);
-    exec_info->next = child_waited_list;
-    child_waited_list = exec_info;
-    uv_mutex_unlock(&wait_children_mutex);
-}
-
-static void after_pipe_write(uv_write_t *req, int status)
-{
-    (void)status;
-#ifdef SPAWN_DEBUG
-    fprintf(stderr, "SERVER %s called status=%d\n", __func__, status);
-#endif
-    void **data = req->data;
-    freez(data[0]);
-    freez(data[1]);
-    freez(data);
-}
-
-static void child_waited_async_cb(uv_async_t *async_handle)
-{
-    uv_buf_t *writebuf;
-    int ret;
-    struct spawn_execution_info *exec_info;
-    struct write_context *write_ctx;
-
-    (void)async_handle;
-    while (NULL != (exec_info = dequeue_child_waited_list())) {
-        write_ctx = mallocz(sizeof(*write_ctx));
-
-        void **data = callocz(2, sizeof(void *));
-        writebuf = callocz(2, sizeof(uv_buf_t));
-
-        data[0] = write_ctx;
-        data[1] = writebuf;
-        write_ctx->write_req.data = data;
-
-        write_ctx->header.opcode = SPAWN_PROT_CMD_EXIT_STATUS;
-        write_ctx->header.handle = exec_info->handle;
-        write_ctx->exit_status.exec_exit_status = exec_info->exit_status;
-        writebuf[0] = uv_buf_init((char *) &write_ctx->header, sizeof(write_ctx->header));
-        writebuf[1] = uv_buf_init((char *) &write_ctx->exit_status, sizeof(write_ctx->exit_status));
-#ifdef SPAWN_DEBUG
-        fprintf(stderr, "SERVER %s SPAWN_PROT_CMD_EXIT_STATUS\n", __func__);
-#endif
-        ret = uv_write(&write_ctx->write_req, (uv_stream_t *) &server_pipe, writebuf, 2, after_pipe_write);
-        fatal_assert(ret == 0);
-
-        freez(exec_info);
-    }
-}
-
-static void wait_children(void *arg)
-{
-    siginfo_t i;
-    struct spawn_execution_info tmp, *exec_info;
-    avl_t *ret_avl;
-
-    (void)arg;
-    while (!server_shutdown) {
-        uv_mutex_lock(&wait_children_mutex);
-        while (!spawned_processes) {
-            uv_cond_wait(&wait_children_cond, &wait_children_mutex);
-        }
-        spawned_processes = 0;
-        uv_mutex_unlock(&wait_children_mutex);
-
-        while (!server_shutdown) {
-            i.si_pid = 0;
-            if (waitid(P_ALL, (id_t) 0, &i, WEXITED) == -1) {
-                if (errno != ECHILD)
-                    fprintf(stderr, "SPAWN: Failed to wait: %s\n", strerror(errno));
-                break;
-            }
-            if (i.si_pid == 0) {
-                fprintf(stderr, "SPAWN: No child exited.\n");
-                break;
-            }
-#ifdef SPAWN_DEBUG
-            fprintf(stderr, "SPAWN: Successfully waited for pid:%d.\n", (int) i.si_pid);
-#endif
-            fatal_assert(CLD_EXITED == i.si_code);
-            tmp.pid = (pid_t)i.si_pid;
-            while (NULL == (ret_avl = avl_remove_lock(&spawn_outstanding_exec_tree, (avl_t *)&tmp))) {
-                fprintf(stderr,
-                        "SPAWN: race condition detected, waiting for child process %d to be indexed.\n",
-                        (int)tmp.pid);
-                (void)sleep_usec(10000); /* 10 msec */
-            }
-            exec_info = (struct spawn_execution_info *)ret_avl;
-            exec_info->exit_status = i.si_status;
-            enqueue_child_waited_list(exec_info);
-
-            /* wake up event loop */
-            fatal_assert(0 == uv_async_send(&child_waited_async));
-        }
-    }
-}
-
-void spawn_protocol_execute_command(void *handle, char *command_to_run, uint16_t command_length)
-{
-    uv_buf_t *writebuf;
-    int ret;
-    avl_t *avl_ret;
-    struct spawn_execution_info *exec_info;
-    struct write_context *write_ctx;
-
-    write_ctx = mallocz(sizeof(*write_ctx));
-    void **data = callocz(2, sizeof(void *));
-    writebuf = callocz(2, sizeof(uv_buf_t));
-    data[0] = write_ctx;
-    data[1] = writebuf;
-    write_ctx->write_req.data = data;
-
-    command_to_run[command_length] = '\0';
-#ifdef SPAWN_DEBUG
-    fprintf(stderr, "SPAWN: executing command '%s'\n", command_to_run);
-#endif
-    if (netdata_spawn(command_to_run, &write_ctx->spawn_result.exec_pid)) {
-        fprintf(stderr, "SPAWN: Cannot spawn(\"%s\", \"r\").\n", command_to_run);
-        write_ctx->spawn_result.exec_pid = 0;
-    } else { /* successfully spawned command */
-        write_ctx->spawn_result.exec_run_timestamp = now_realtime_sec();
-
-        /* record it for when the process finishes execution */
-        exec_info = mallocz(sizeof(*exec_info));
-        exec_info->handle = handle;
-        exec_info->pid = write_ctx->spawn_result.exec_pid;
-        avl_ret = avl_insert_lock(&spawn_outstanding_exec_tree, (avl_t *)exec_info);
-        fatal_assert(avl_ret == (avl_t *)exec_info);
-
-        /* wake up the thread that blocks waiting for processes to exit */
-        uv_mutex_lock(&wait_children_mutex);
-        spawned_processes = 1;
-        uv_cond_signal(&wait_children_cond);
-        uv_mutex_unlock(&wait_children_mutex);
-    }
-
-    write_ctx->header.opcode = SPAWN_PROT_SPAWN_RESULT;
-    write_ctx->header.handle = handle;
-    writebuf[0] = uv_buf_init((char *)&write_ctx->header, sizeof(write_ctx->header));
-    writebuf[1] = uv_buf_init((char *)&write_ctx->spawn_result, sizeof(write_ctx->spawn_result));
-#ifdef SPAWN_DEBUG
-    fprintf(stderr, "SERVER %s SPAWN_PROT_SPAWN_RESULT\n", __func__);
-#endif
-    ret = uv_write(&write_ctx->write_req, (uv_stream_t *)&server_pipe, writebuf, 2, after_pipe_write);
-    fatal_assert(ret == 0);
-}
-
-static void server_parse_spawn_protocol(unsigned source_len, char *source)
-{
-    unsigned required_len;
-    struct spawn_prot_header *header;
-    struct spawn_prot_exec_cmd *payload;
-    uint16_t command_length;
-
-    while (source_len) {
-        required_len = sizeof(*header);
-        if (prot_buffer_len < required_len)
-            copy_to_prot_buffer(prot_buffer, &prot_buffer_len, required_len - prot_buffer_len, &source, &source_len);
-        if (prot_buffer_len < required_len)
-            return; /* Source buffer ran out */
-
-        header = (struct spawn_prot_header *)prot_buffer;
-        fatal_assert(SPAWN_PROT_EXEC_CMD == header->opcode);
-        fatal_assert(NULL != header->handle);
-
-        required_len += sizeof(*payload);
-        if (prot_buffer_len < required_len)
-            copy_to_prot_buffer(prot_buffer, &prot_buffer_len, required_len - prot_buffer_len, &source, &source_len);
-        if (prot_buffer_len < required_len)
-            return; /* Source buffer ran out */
-
-        payload = (struct spawn_prot_exec_cmd *)(header + 1);
-        command_length = payload->command_length;
-
-        required_len += command_length;
-        if (unlikely(required_len > MAX_COMMAND_LENGTH - 1)) {
-            fprintf(stderr, "SPAWN: Ran out of protocol buffer space.\n");
-            command_length = (MAX_COMMAND_LENGTH - 1) - (sizeof(*header) + sizeof(*payload));
-            required_len = MAX_COMMAND_LENGTH - 1;
-        }
-        if (prot_buffer_len < required_len)
-            copy_to_prot_buffer(prot_buffer, &prot_buffer_len, required_len - prot_buffer_len, &source, &source_len);
-        if (prot_buffer_len < required_len)
-            return; /* Source buffer ran out */
-
-        spawn_protocol_execute_command(header->handle, payload->command_to_run, command_length);
-        prot_buffer_len = 0;
-    }
-}
-
-static void on_pipe_read(uv_stream_t *pipe, ssize_t nread, const uv_buf_t *buf)
-{
-    if (0 == nread) {
-        fprintf(stderr, "SERVER %s: Zero bytes read from spawn pipe.\n", __func__);
-    } else if (UV_EOF == nread) {
-        fprintf(stderr, "EOF found in spawn pipe.\n");
-    } else if (nread < 0) {
-        fprintf(stderr, "%s: %s\n", __func__, uv_strerror(nread));
-    }
-
-    if (nread < 0) { /* stop spawn server due to EOF or error */
-        int error;
-
-        uv_mutex_lock(&wait_children_mutex);
-        server_shutdown = 1;
-        spawned_processes = 1;
-        uv_cond_signal(&wait_children_cond);
-        uv_mutex_unlock(&wait_children_mutex);
-
-        fprintf(stderr, "Shutting down spawn server event loop.\n");
-        /* cleanup operations of the event loop */
-        (void)uv_read_stop((uv_stream_t *) pipe);
-        uv_close((uv_handle_t *)&server_pipe, NULL);
-
-        error = uv_thread_join(&thread);
-        if (error) {
-            fprintf(stderr, "uv_thread_create(): %s", uv_strerror(error));
-        }
-        /* After joining it is safe to destroy child_waited_async */
-        uv_close((uv_handle_t *)&child_waited_async, NULL);
-    } else if (nread) {
-#ifdef SPAWN_DEBUG
-        fprintf(stderr, "SERVER %s nread %u\n", __func__, (unsigned)nread);
-#endif
-        server_parse_spawn_protocol(nread, buf->base);
-    }
-    if (buf && buf->len) {
-        freez(buf->base);
-    }
-}
-
-static void on_read_alloc(uv_handle_t *handle,
-                          size_t suggested_size,
-                          uv_buf_t* buf)
-{
-    (void)handle;
-    buf->base = mallocz(suggested_size);
-    buf->len = suggested_size;
-}
-
-static void ignore_signal_handler(int signo) {
-    /*
-     * By having a signal handler we allow spawned processes to reset default signal dispositions. Setting SIG_IGN
-     * would be inherited by the spawned children which is not desirable.
-     */
-    (void)signo;
-}
-
-void spawn_server(void)
-{
-    int error;
-
-    // initialize the system clocks
-    clocks_init();
-
-    // close all open file descriptors, except the standard ones
-    // the caller may have left open files (lxc-attach has this issue)
-    for_each_open_fd(OPEN_FD_ACTION_CLOSE, OPEN_FD_EXCLUDE_STDIN | OPEN_FD_EXCLUDE_STDOUT | OPEN_FD_EXCLUDE_STDERR);
-
-    // Have the libuv IPC pipe be closed when forking child processes
-    (void) fcntl(0, F_SETFD, FD_CLOEXEC);
-    fprintf(stderr, "Spawn server is up.\n");
-
-    // Define signals we want to ignore
-    struct sigaction sa;
-    int signals_to_ignore[] = {SIGPIPE, SIGINT, SIGQUIT, SIGTERM, SIGHUP, SIGUSR1, SIGUSR2, SIGBUS, SIGCHLD};
-    unsigned ignore_length = sizeof(signals_to_ignore) / sizeof(signals_to_ignore[0]);
-
-    unsigned i;
-    for (i = 0; i < ignore_length ; ++i) {
-        sa.sa_flags = 0;
-        sigemptyset(&sa.sa_mask);
-        sa.sa_handler = ignore_signal_handler;
-        if(sigaction(signals_to_ignore[i], &sa, NULL) == -1)
-            fprintf(stderr, "SPAWN: Failed to change signal handler for signal: %d.\n", signals_to_ignore[i]);
-    }
-
-    signals_unblock();
-
-    loop = uv_default_loop();
-    loop->data = NULL;
-
-    error = uv_pipe_init(loop, &server_pipe, 1);
-    if (error) {
-        fprintf(stderr, "uv_pipe_init(): %s\n", uv_strerror(error));
-        exit(error);
-    }
-    fatal_assert(server_pipe.ipc);
-
-    error = uv_pipe_open(&server_pipe, 0 /* UV_STDIN_FD */);
-    if (error) {
-        fprintf(stderr, "uv_pipe_open(): %s\n", uv_strerror(error));
-        exit(error);
-    }
-    avl_init_lock(&spawn_outstanding_exec_tree, spawn_exec_compare);
-
-    spawned_processes = 0;
-    fatal_assert(0 == uv_cond_init(&wait_children_cond));
-    fatal_assert(0 == uv_mutex_init(&wait_children_mutex));
-    child_waited_list = NULL;
-    error = uv_async_init(loop, &child_waited_async, child_waited_async_cb);
-    if (error) {
-        fprintf(stderr, "uv_async_init(): %s\n", uv_strerror(error));
-        exit(error);
-    }
-
-    error = uv_thread_create(&thread, wait_children, NULL);
-    if (error) {
-        fprintf(stderr, "uv_thread_create(): %s\n", uv_strerror(error));
-        exit(error);
-    }
-
-    prot_buffer_len = 0;
-    error = uv_read_start((uv_stream_t *)&server_pipe, on_read_alloc, on_pipe_read);
-    fatal_assert(error == 0);
-
-    while (!server_shutdown) {
-        uv_run(loop, UV_RUN_DEFAULT);
-    }
-    fprintf(stderr, "Shutting down spawn server loop complete.\n");
-    fatal_assert(0 == uv_loop_close(loop));
-
-    exit(0);
-}