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Minor cosmetic tweaks to the KFMon list code (#24)

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* Switch to an enum for kfmon ipc errors codes.
* Also switch to a case switch in nm_kfmon_return_handler.
* Comment out the default case to have -Wswitch shout at you if you missed
one.
* Simplify pointer chasing loop.
* Explicitly mention KFMON_IPC_EAGAIN in the return_handler.
* Simplify some more.
* Make GCC happy.
* Slightly less convoluted.
* Alphabetical header order.
This commit is contained in:
NiLuJe
2020-05-13 17:05:05 -04:00
parent 1968f0c959
commit ec8fcd69be
2 changed files with 64 additions and 62 deletions
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66
src/kfmon.c
View File

@@ -1,18 +1,18 @@
#define _GNU_SOURCE
#include <errno.h>
#include <linux/limits.h>
#include <poll.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/un.h>
#include <unistd.h>
#include <linux/limits.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "util.h"
#include "kfmon_helpers.h"
#include "kfmon.h"
#include "kfmon_helpers.h"
#include "util.h"
// Free all resources allocated by a list and its nodes
static void teardown_list(kfmon_watch_list_t* list) {
@@ -405,11 +405,9 @@ int nm_kfmon_list_request(const char *restrict foo __attribute__((unused))) {
NM_LOG("List has %zu nodes", list.count);
NM_LOG("Head is at %p", list.head);
NM_LOG("Tail is at %p", list.tail);
kfmon_watch_node_t* node = list.head;
while (node) {
for (kfmon_watch_node_t* node = list.head; node != NULL; node = node->next) {
NM_LOG("Dumping node at %p", node);
NM_LOG("idx: %hhu // filename: %s // label: %s", node->watch.idx, node->watch.filename, node->watch.label);
node = node->next;
}
// Destroy it
@@ -421,61 +419,61 @@ int nm_kfmon_list_request(const char *restrict foo __attribute__((unused))) {
}
// Giant ladder of fail
nm_action_result_t* nm_kfmon_return_handler(int status, char **err_out) {
nm_action_result_t* nm_kfmon_return_handler(kfmon_ipc_errno_e status, char **err_out) {
#define NM_ERR_RET NULL
if (status != EXIT_SUCCESS) {
switch (status) {
case KFMON_IPC_OK:
NM_RETURN_OK(nm_action_result_silent());
// Fail w/ the right log message
if (status == KFMON_IPC_ETIMEDOUT) {
case KFMON_IPC_ETIMEDOUT:
NM_RETURN_ERR("Timed out waiting for KFMon");
} else if (status == KFMON_IPC_EPIPE) {
case KFMON_IPC_EPIPE:
NM_RETURN_ERR("KFMon closed the connection");
} else if (status == KFMON_IPC_ENODATA) {
case KFMON_IPC_ENODATA:
NM_RETURN_ERR("No more data to read");
} else if (status == KFMON_IPC_READ_FAILURE) {
case KFMON_IPC_READ_FAILURE:
// NOTE: Let's hope close() won't mangle errno...
NM_RETURN_ERR("read: %m");
} else if (status == KFMON_IPC_SEND_FAILURE) {
case KFMON_IPC_SEND_FAILURE:
// NOTE: Let's hope close() won't mangle errno...
NM_RETURN_ERR("send: %m");
} else if (status == KFMON_IPC_SOCKET_FAILURE) {
case KFMON_IPC_SOCKET_FAILURE:
NM_RETURN_ERR("Failed to create local KFMon IPC socket (socket: %m)");
} else if (status == KFMON_IPC_CONNECT_FAILURE) {
case KFMON_IPC_CONNECT_FAILURE:
NM_RETURN_ERR("KFMon IPC is down (connect: %m)");
} else if (status == KFMON_IPC_POLL_FAILURE) {
case KFMON_IPC_POLL_FAILURE:
// NOTE: Let's hope close() won't mangle errno...
NM_RETURN_ERR("poll: %m");
} else if (status == KFMON_IPC_CALLOC_FAILURE) {
case KFMON_IPC_CALLOC_FAILURE:
NM_RETURN_ERR("calloc: %m");
} else if (status == KFMON_IPC_REPLY_READ_FAILURE) {
case KFMON_IPC_REPLY_READ_FAILURE:
// NOTE: Let's hope close() won't mangle errno...
NM_RETURN_ERR("Failed to read KFMon's reply (%m)");
} else if (status == KFMON_IPC_LIST_PARSE_FAILURE) {
case KFMON_IPC_LIST_PARSE_FAILURE:
NM_RETURN_ERR("Failed to parse the list of watches (no separator found)");
} else if (status == KFMON_IPC_ERR_INVALID_ID) {
case KFMON_IPC_ERR_INVALID_ID:
NM_RETURN_ERR("Requested to start an invalid watch index");
} else if (status == KFMON_IPC_ERR_INVALID_NAME) {
case KFMON_IPC_ERR_INVALID_NAME:
NM_RETURN_ERR("Requested to trigger an invalid watch filename (expected the basename of the image trigger)");
} else if (status == KFMON_IPC_WARN_ALREADY_RUNNING) {
case KFMON_IPC_WARN_ALREADY_RUNNING:
NM_RETURN_ERR("Requested watch is already running");
} else if (status == KFMON_IPC_WARN_SPAWN_BLOCKED) {
case KFMON_IPC_WARN_SPAWN_BLOCKED:
NM_RETURN_ERR("A spawn blocker is currently running");
} else if (status == KFMON_IPC_WARN_SPAWN_INHIBITED) {
case KFMON_IPC_WARN_SPAWN_INHIBITED:
NM_RETURN_ERR("Spawns are currently inhibited");
} else if (status == KFMON_IPC_ERR_REALLY_MALFORMED_CMD) {
case KFMON_IPC_ERR_REALLY_MALFORMED_CMD:
NM_RETURN_ERR("KFMon couldn't parse our command");
} else if (status == KFMON_IPC_ERR_MALFORMED_CMD) {
case KFMON_IPC_ERR_MALFORMED_CMD:
NM_RETURN_ERR("Bad command syntax");
} else if (status == KFMON_IPC_ERR_INVALID_CMD) {
case KFMON_IPC_ERR_INVALID_CMD:
NM_RETURN_ERR("Command wasn't recognized by KFMon");
} else if (status == KFMON_IPC_UNKNOWN_REPLY) {
case KFMON_IPC_UNKNOWN_REPLY:
NM_RETURN_ERR("We couldn't make sense of KFMon's reply");
} else {
case KFMON_IPC_EAGAIN:
default:
// Should never happen
NM_RETURN_ERR("Something went wrong");
}
} else {
NM_RETURN_OK(nm_action_result_silent());
}
#undef NM_ERR_RET

60
src/kfmon.h
View File

@@ -6,38 +6,42 @@ extern "C" {
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "action.h"
// Path to KFMon's IPC Unix socket
#define KFMON_IPC_SOCKET "/tmp/kfmon-ipc.ctl"
// Flags for the failure bingo bitmask
#define KFMON_IPC_ETIMEDOUT (1 << 1)
#define KFMON_IPC_EPIPE (1 << 2)
#define KFMON_IPC_ENODATA (1 << 3)
// syscall failures
#define KFMON_IPC_READ_FAILURE (1 << 4)
#define KFMON_IPC_SEND_FAILURE (1 << 5)
#define KFMON_IPC_SOCKET_FAILURE (1 << 6)
#define KFMON_IPC_CONNECT_FAILURE (1 << 7)
#define KFMON_IPC_POLL_FAILURE (1 << 8)
#define KFMON_IPC_CALLOC_FAILURE (1 << 9)
#define KFMON_IPC_REPLY_READ_FAILURE (1 << 10)
#define KFMON_IPC_LIST_PARSE_FAILURE (1 << 11)
// Those match the actual string sent over the wire
#define KFMON_IPC_ERR_INVALID_ID (1 << 12)
#define KFMON_IPC_ERR_INVALID_NAME (1 << 13)
#define KFMON_IPC_WARN_ALREADY_RUNNING (1 << 14)
#define KFMON_IPC_WARN_SPAWN_BLOCKED (1 << 15)
#define KFMON_IPC_WARN_SPAWN_INHIBITED (1 << 16)
#define KFMON_IPC_ERR_REALLY_MALFORMED_CMD (1 << 17)
#define KFMON_IPC_ERR_MALFORMED_CMD (1 << 18)
#define KFMON_IPC_ERR_INVALID_CMD (1 << 19)
// Not an error ;p
//#define KFMON_IPC_OK
#define KFMON_IPC_UNKNOWN_REPLY (1 << 20)
// Not an error either, needs we have more to read...
#define KFMON_IPC_EAGAIN (1 << 21)
// Flags for the failure bingo
typedef enum {
// Not an error ;p
KFMON_IPC_OK = EXIT_SUCCESS,
// NOTE: Start > 256 to stay clear of errno
KFMON_IPC_ETIMEDOUT = 512,
KFMON_IPC_EPIPE,
KFMON_IPC_ENODATA,
// syscall failures
KFMON_IPC_READ_FAILURE,
KFMON_IPC_SEND_FAILURE,
KFMON_IPC_SOCKET_FAILURE,
KFMON_IPC_CONNECT_FAILURE,
KFMON_IPC_POLL_FAILURE,
KFMON_IPC_CALLOC_FAILURE,
KFMON_IPC_REPLY_READ_FAILURE,
KFMON_IPC_LIST_PARSE_FAILURE,
// Those match the actual string sent over the wire
KFMON_IPC_ERR_INVALID_ID,
KFMON_IPC_ERR_INVALID_NAME,
KFMON_IPC_WARN_ALREADY_RUNNING,
KFMON_IPC_WARN_SPAWN_BLOCKED,
KFMON_IPC_WARN_SPAWN_INHIBITED,
KFMON_IPC_ERR_REALLY_MALFORMED_CMD,
KFMON_IPC_ERR_MALFORMED_CMD,
KFMON_IPC_ERR_INVALID_CMD,
KFMON_IPC_UNKNOWN_REPLY,
// Not an error either, means we have more to read...
KFMON_IPC_EAGAIN,
} kfmon_ipc_errno_e;
// A single watch item
typedef struct {
@@ -65,7 +69,7 @@ typedef struct {
typedef int (*ipc_handler_t)(int, void *);
// Given one of the error codes listed above, return properly from an action. Success is silent.
nm_action_result_t* nm_kfmon_return_handler(int error, char **err_out);
nm_action_result_t* nm_kfmon_return_handler(kfmon_ipc_errno_e status, char **err_out);
// Send a simple KFMon IPC request, one where the reply is only used for its diagnostic value.
int nm_kfmon_simple_request(const char *restrict ipc_cmd, const char *restrict ipc_arg);