97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
|
|
/* define macros for having usleep */
|
|
#define _BSD_SOURCE
|
|
#define _DEFAULT_SOURCE
|
|
|
|
#include "redismodule.h"
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <unistd.h>
|
|
|
|
#define UNUSED(V) ((void) V)
|
|
|
|
int child_pid = -1;
|
|
int exitted_with_code = -1;
|
|
|
|
void done_handler(int exitcode, int bysignal, void *user_data) {
|
|
child_pid = -1;
|
|
exitted_with_code = exitcode;
|
|
assert(user_data==(void*)0xdeadbeef);
|
|
UNUSED(bysignal);
|
|
}
|
|
|
|
int fork_create(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
|
|
{
|
|
long long code_to_exit_with;
|
|
long long usleep_us;
|
|
if (argc != 3) {
|
|
RedisModule_WrongArity(ctx);
|
|
return REDISMODULE_OK;
|
|
}
|
|
|
|
if(!RMAPI_FUNC_SUPPORTED(RedisModule_Fork)){
|
|
RedisModule_ReplyWithError(ctx, "Fork api is not supported in the current redis version");
|
|
return REDISMODULE_OK;
|
|
}
|
|
|
|
RedisModule_StringToLongLong(argv[1], &code_to_exit_with);
|
|
RedisModule_StringToLongLong(argv[2], &usleep_us);
|
|
exitted_with_code = -1;
|
|
int fork_child_pid = RedisModule_Fork(done_handler, (void*)0xdeadbeef);
|
|
if (fork_child_pid < 0) {
|
|
RedisModule_ReplyWithError(ctx, "Fork failed");
|
|
return REDISMODULE_OK;
|
|
} else if (fork_child_pid > 0) {
|
|
/* parent */
|
|
child_pid = fork_child_pid;
|
|
RedisModule_ReplyWithLongLong(ctx, child_pid);
|
|
return REDISMODULE_OK;
|
|
}
|
|
|
|
/* child */
|
|
RedisModule_Log(ctx, "notice", "fork child started");
|
|
usleep(usleep_us);
|
|
RedisModule_Log(ctx, "notice", "fork child exiting");
|
|
RedisModule_ExitFromChild(code_to_exit_with);
|
|
/* unreachable */
|
|
return 0;
|
|
}
|
|
|
|
int fork_exitcode(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
|
|
{
|
|
UNUSED(argv);
|
|
UNUSED(argc);
|
|
RedisModule_ReplyWithLongLong(ctx, exitted_with_code);
|
|
return REDISMODULE_OK;
|
|
}
|
|
|
|
int fork_kill(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
|
|
{
|
|
UNUSED(argv);
|
|
UNUSED(argc);
|
|
if (RedisModule_KillForkChild(child_pid) != REDISMODULE_OK)
|
|
RedisModule_ReplyWithError(ctx, "KillForkChild failed");
|
|
else
|
|
RedisModule_ReplyWithLongLong(ctx, 1);
|
|
child_pid = -1;
|
|
return REDISMODULE_OK;
|
|
}
|
|
|
|
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
|
|
UNUSED(argv);
|
|
UNUSED(argc);
|
|
if (RedisModule_Init(ctx,"fork",1,REDISMODULE_APIVER_1)== REDISMODULE_ERR)
|
|
return REDISMODULE_ERR;
|
|
|
|
if (RedisModule_CreateCommand(ctx,"fork.create", fork_create,"",0,0,0) == REDISMODULE_ERR)
|
|
return REDISMODULE_ERR;
|
|
|
|
if (RedisModule_CreateCommand(ctx,"fork.exitcode", fork_exitcode,"",0,0,0) == REDISMODULE_ERR)
|
|
return REDISMODULE_ERR;
|
|
|
|
if (RedisModule_CreateCommand(ctx,"fork.kill", fork_kill,"",0,0,0) == REDISMODULE_ERR)
|
|
return REDISMODULE_ERR;
|
|
|
|
return REDISMODULE_OK;
|
|
}
|