X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=server.c;h=db9d8594c8b84c59003cf0d58270bbca197c8fb5;hp=541216ca6a77f41d9001ded8ecc3e51ef54f17dc;hb=7b8216842eb888ff626f616c2770a2548b0b0bf9;hpb=5c341e9a5734742ae1137388345d4f47efdd4f05

diff --git a/server.c b/server.c
index 541216ca..db9d8594 100644
--- a/server.c
+++ b/server.c
@@ -1,114 +1,1072 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <unistd.h>
 #include <limits.h>
-#include <string.h>
-#include <getopt.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/poll.h>
-#include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
-#include <sys/time.h>
-#include <sys/mman.h>
-#include <signal.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/un.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <netdb.h>
+#include <syslog.h>
+#include <signal.h>
 
 #include "fio.h"
+#include "server.h"
+#include "crc/crc16.h"
+#include "ieee754.h"
 
-static int net_port = 8765;
+#include "fio_version.h"
 
-static int accept_loop(int listen_sk)
+int fio_net_port = 8765;
+
+int exit_backend = 0;
+
+static int server_fd = -1;
+static char *fio_server_arg;
+static char *bind_sock;
+static struct sockaddr_in saddr_in;
+
+static const char *fio_server_ops[FIO_NET_CMD_NR] = {
+	"",
+	"QUIT",
+	"EXIT",
+	"JOB",
+	"JOBLINE",
+	"TEXT",
+	"TS",
+	"GS",
+	"SEND_ETA",
+	"ETA",
+	"PROBE",
+	"START",
+	"STOP"
+};
+
+const char *fio_server_op(unsigned int op)
 {
-	struct sockaddr addr;
-	unsigned int len = sizeof(addr);
-	int sk, do_exit = 0;
+	static char buf[32];
 
-again:
-	sk = accept(listen_sk, &addr, &len);
-	if (sk < 0) {
-		log_err("fio: accept failed\n");
+	if (op < FIO_NET_CMD_NR)
+		return fio_server_ops[op];
+
+	sprintf(buf, "UNKNOWN/%d", op);
+	return buf;
+}
+
+int fio_send_data(int sk, const void *p, unsigned int len)
+{
+	assert(len <= sizeof(struct fio_net_cmd) + FIO_SERVER_MAX_PDU);
+
+	do {
+		int ret = send(sk, p, len, 0);
+
+		if (ret > 0) {
+			len -= ret;
+			if (!len)
+				break;
+			p += ret;
+			continue;
+		} else if (!ret)
+			break;
+		else if (errno == EAGAIN || errno == EINTR)
+			continue;
+		else
+			break;
+	} while (!exit_backend);
+
+	if (!len)
+		return 0;
+
+	return 1;
+}
+
+int fio_recv_data(int sk, void *p, unsigned int len)
+{
+	do {
+		int ret = recv(sk, p, len, MSG_WAITALL);
+
+		if (ret > 0) {
+			len -= ret;
+			if (!len)
+				break;
+			p += ret;
+			continue;
+		} else if (!ret)
+			break;
+		else if (errno == EAGAIN || errno == EINTR)
+			continue;
+		else
+			break;
+	} while (!exit_backend);
+
+	if (!len)
+		return 0;
+
+	return -1;
+}
+
+static int verify_convert_cmd(struct fio_net_cmd *cmd)
+{
+	uint16_t crc;
+
+	cmd->cmd_crc16 = le16_to_cpu(cmd->cmd_crc16);
+	cmd->pdu_crc16 = le16_to_cpu(cmd->pdu_crc16);
+
+	crc = crc16(cmd, FIO_NET_CMD_CRC_SZ);
+	if (crc != cmd->cmd_crc16) {
+		log_err("fio: server bad crc on command (got %x, wanted %x)\n",
+				cmd->cmd_crc16, crc);
+		return 1;
+	}
+
+	cmd->version	= le16_to_cpu(cmd->version);
+	cmd->opcode	= le16_to_cpu(cmd->opcode);
+	cmd->flags	= le32_to_cpu(cmd->flags);
+	cmd->tag	= le64_to_cpu(cmd->tag);
+	cmd->pdu_len	= le32_to_cpu(cmd->pdu_len);
+
+	switch (cmd->version) {
+	case FIO_SERVER_VER:
+		break;
+	default:
+		log_err("fio: bad server cmd version %d\n", cmd->version);
+		return 1;
+	}
+
+	if (cmd->pdu_len > FIO_SERVER_MAX_PDU) {
+		log_err("fio: command payload too large: %u\n", cmd->pdu_len);
+		return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * Read (and defragment, if necessary) incoming commands
+ */
+struct fio_net_cmd *fio_net_recv_cmd(int sk)
+{
+	struct fio_net_cmd cmd, *cmdret = NULL;
+	size_t cmd_size = 0, pdu_offset = 0;
+	uint16_t crc;
+	int ret, first = 1;
+	void *pdu = NULL;
+
+	do {
+		ret = fio_recv_data(sk, &cmd, sizeof(cmd));
+		if (ret)
+			break;
+
+		/* We have a command, verify it and swap if need be */
+		ret = verify_convert_cmd(&cmd);
+		if (ret)
+			break;
+
+		if (first) {
+			/* if this is text, add room for \0 at the end */
+			cmd_size = sizeof(cmd) + cmd.pdu_len + 1;
+			assert(!cmdret);
+		} else
+			cmd_size += cmd.pdu_len;
+
+		cmdret = realloc(cmdret, cmd_size);
+
+		if (first)
+			memcpy(cmdret, &cmd, sizeof(cmd));
+		else
+			assert(cmdret->opcode == cmd.opcode);
+
+		if (!cmd.pdu_len)
+			break;
+
+		/* There's payload, get it */
+		pdu = (void *) cmdret->payload + pdu_offset;
+		ret = fio_recv_data(sk, pdu, cmd.pdu_len);
+		if (ret)
+			break;
+
+		/* Verify payload crc */
+		crc = crc16(pdu, cmd.pdu_len);
+		if (crc != cmd.pdu_crc16) {
+			log_err("fio: server bad crc on payload ");
+			log_err("(got %x, wanted %x)\n", cmd.pdu_crc16, crc);
+			ret = 1;
+			break;
+		}
+
+		pdu_offset += cmd.pdu_len;
+		if (!first)
+			cmdret->pdu_len += cmd.pdu_len;
+		first = 0;
+	} while (cmd.flags & FIO_NET_CMD_F_MORE);
+
+	if (ret) {
+		free(cmdret);
+		cmdret = NULL;
+	} else if (cmdret) {
+		/* zero-terminate text input */
+		if (cmdret->pdu_len && (cmdret->opcode == FIO_NET_CMD_TEXT ||
+		    cmdret->opcode == FIO_NET_CMD_JOB)) {
+			char *buf = (char *) cmdret->payload;
+
+			buf[cmdret->pdu_len ] = '\0';
+		}
+		/* frag flag is internal */
+		cmdret->flags &= ~FIO_NET_CMD_F_MORE;
+	}
+
+	return cmdret;
+}
+
+void fio_net_cmd_crc(struct fio_net_cmd *cmd)
+{
+	uint32_t pdu_len;
+
+	cmd->cmd_crc16 = __cpu_to_le16(crc16(cmd, FIO_NET_CMD_CRC_SZ));
+
+	pdu_len = le32_to_cpu(cmd->pdu_len);
+	if (pdu_len)
+		cmd->pdu_crc16 = __cpu_to_le16(crc16(cmd->payload, pdu_len));
+}
+
+int fio_net_send_cmd(int fd, uint16_t opcode, const void *buf, off_t size,
+		     uint64_t tag)
+{
+	struct fio_net_cmd *cmd = NULL;
+	size_t this_len, cur_len = 0;
+	int ret;
+
+	do {
+		this_len = size;
+		if (this_len > FIO_SERVER_MAX_PDU)
+			this_len = FIO_SERVER_MAX_PDU;
+
+		if (!cmd || cur_len < sizeof(*cmd) + this_len) {
+			if (cmd)
+				free(cmd);
+
+			cur_len = sizeof(*cmd) + this_len;
+			cmd = malloc(cur_len);
+		}
+
+		fio_init_net_cmd(cmd, opcode, buf, this_len, tag);
+
+		if (this_len < size)
+			cmd->flags = __cpu_to_le32(FIO_NET_CMD_F_MORE);
+
+		fio_net_cmd_crc(cmd);
+
+		ret = fio_send_data(fd, cmd, sizeof(*cmd) + this_len);
+		size -= this_len;
+		buf += this_len;
+	} while (!ret && size);
+
+	if (cmd)
+		free(cmd);
+
+	return ret;
+}
+
+static int fio_net_send_simple_stack_cmd(int sk, uint16_t opcode, uint64_t tag)
+{
+	struct fio_net_cmd cmd;
+
+	fio_init_net_cmd(&cmd, opcode, NULL, 0, tag);
+	fio_net_cmd_crc(&cmd);
+
+	return fio_send_data(sk, &cmd, sizeof(cmd));
+}
+
+/*
+ * If 'list' is non-NULL, then allocate and store the sent command for
+ * later verification.
+ */
+int fio_net_send_simple_cmd(int sk, uint16_t opcode, uint64_t tag,
+			    struct flist_head *list)
+{
+	struct fio_net_int_cmd *cmd;
+	int ret;
+
+	if (!list)
+		return fio_net_send_simple_stack_cmd(sk, opcode, tag);
+
+	cmd = malloc(sizeof(*cmd));
+
+	fio_init_net_cmd(&cmd->cmd, opcode, NULL, 0, (uint64_t) cmd);
+	fio_net_cmd_crc(&cmd->cmd);
+
+	INIT_FLIST_HEAD(&cmd->list);
+	gettimeofday(&cmd->tv, NULL);
+	cmd->saved_tag = tag;
+
+	ret = fio_send_data(sk, &cmd->cmd, sizeof(cmd->cmd));
+	if (ret) {
+		free(cmd);
+		return ret;
+	}
+
+	flist_add_tail(&cmd->list, list);
+	return 0;
+}
+
+static int fio_server_send_quit_cmd(void)
+{
+	dprint(FD_NET, "server: sending quit\n");
+	return fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_QUIT, 0, NULL);
+}
+
+static int handle_job_cmd(struct fio_net_cmd *cmd)
+{
+	char *buf = (char *) cmd->payload;
+	int ret;
+
+	if (parse_jobs_ini(buf, 1, 0)) {
+		fio_server_send_quit_cmd();
+		return -1;
+	}
+
+	fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_START, 0, NULL);
+
+	ret = exec_run();
+	fio_server_send_quit_cmd();
+	reset_fio_state();
+	return ret;
+}
+
+static int handle_jobline_cmd(struct fio_net_cmd *cmd)
+{
+	void *pdu = cmd->payload;
+	struct cmd_single_line_pdu *cslp;
+	struct cmd_line_pdu *clp;
+	unsigned long offset;
+	char **argv;
+	int ret, i;
+
+	clp = pdu;
+	clp->lines = le16_to_cpu(clp->lines);
+	argv = malloc(clp->lines * sizeof(char *));
+	offset = sizeof(*clp);
+
+	dprint(FD_NET, "server: %d command line args\n", clp->lines);
+
+	for (i = 0; i < clp->lines; i++) {
+		cslp = pdu + offset;
+		argv[i] = (char *) cslp->text;
+
+		offset += sizeof(*cslp) + le16_to_cpu(cslp->len);
+		dprint(FD_NET, "server: %d: %s\n", i, argv[i]);
+	}
+
+	if (parse_cmd_line(clp->lines, argv)) {
+		fio_server_send_quit_cmd();
+		free(argv);
+		return -1;
+	}
+
+	free(argv);
+
+	fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_START, 0, NULL);
+
+	ret = exec_run();
+	fio_server_send_quit_cmd();
+	reset_fio_state();
+	return ret;
+}
+
+static int handle_probe_cmd(struct fio_net_cmd *cmd)
+{
+	struct cmd_probe_pdu probe;
+
+	dprint(FD_NET, "server: sending probe reply\n");
+
+	memset(&probe, 0, sizeof(probe));
+	gethostname((char *) probe.hostname, sizeof(probe.hostname));
+#ifdef FIO_BIG_ENDIAN
+	probe.bigendian = 1;
+#endif
+	probe.fio_major = FIO_MAJOR;
+	probe.fio_minor = FIO_MINOR;
+	probe.fio_patch = FIO_PATCH;
+
+	probe.os	= FIO_OS;
+	probe.arch	= FIO_ARCH;
+
+	return fio_net_send_cmd(server_fd, FIO_NET_CMD_PROBE, &probe, sizeof(probe), cmd->tag);
+}
+
+static int handle_send_eta_cmd(struct fio_net_cmd *cmd)
+{
+	struct jobs_eta *je;
+	size_t size;
+	int i;
+
+	size = sizeof(*je) + thread_number * sizeof(char);
+	je = malloc(size);
+	memset(je, 0, size);
+
+	if (!calc_thread_status(je, 1)) {
+		free(je);
+		return 0;
+	}
+
+	dprint(FD_NET, "server sending status\n");
+
+	je->nr_running		= cpu_to_le32(je->nr_running);
+	je->nr_ramp		= cpu_to_le32(je->nr_ramp);
+	je->nr_pending		= cpu_to_le32(je->nr_pending);
+	je->files_open		= cpu_to_le32(je->files_open);
+	je->m_rate		= cpu_to_le32(je->m_rate);
+	je->t_rate		= cpu_to_le32(je->t_rate);
+	je->m_iops		= cpu_to_le32(je->m_iops);
+	je->t_iops		= cpu_to_le32(je->t_iops);
+
+	for (i = 0; i < 2; i++) {
+		je->rate[i]	= cpu_to_le32(je->rate[i]);
+		je->iops[i]	= cpu_to_le32(je->iops[i]);
+	}
+
+	je->elapsed_sec		= cpu_to_le32(je->nr_running);
+	je->eta_sec		= cpu_to_le64(je->eta_sec);
+
+	fio_net_send_cmd(server_fd, FIO_NET_CMD_ETA, je, size, cmd->tag);
+	free(je);
+	return 0;
+}
+
+static int handle_command(struct fio_net_cmd *cmd)
+{
+	int ret;
+
+	dprint(FD_NET, "server: got op [%s], pdu=%u, tag=%lx\n",
+			fio_server_op(cmd->opcode), cmd->pdu_len, cmd->tag);
+
+	switch (cmd->opcode) {
+	case FIO_NET_CMD_QUIT:
+		fio_terminate_threads(TERMINATE_ALL);
+		return -1;
+	case FIO_NET_CMD_EXIT:
+		exit_backend = 1;
 		return -1;
+	case FIO_NET_CMD_JOB:
+		ret = handle_job_cmd(cmd);
+		break;
+	case FIO_NET_CMD_JOBLINE:
+		ret = handle_jobline_cmd(cmd);
+		break;
+	case FIO_NET_CMD_PROBE:
+		ret = handle_probe_cmd(cmd);
+		break;
+	case FIO_NET_CMD_SEND_ETA:
+		ret = handle_send_eta_cmd(cmd);
+		break;
+	default:
+		log_err("fio: unknown opcode: %s\n",fio_server_op(cmd->opcode));
+		ret = 1;
 	}
 
+	return ret;
+}
+
+static int handle_connection(int sk, int block)
+{
+	struct fio_net_cmd *cmd = NULL;
+	int ret = 0;
+
 	/* read forever */
-	while (!do_exit) {
-		char buf[131072];
-		int ret;
+	while (!exit_backend) {
+		struct pollfd pfd = {
+			.fd	= sk,
+			.events	= POLLIN,
+		};
 
-		ret = recv(sk, buf, 4096, 0);
-		if (ret > 0) {
-			if (!strncmp("FIO_QUIT", buf, 8)) {
-				do_exit = 1;
+		ret = 0;
+		do {
+			ret = poll(&pfd, 1, 100);
+			if (ret < 0) {
+				if (errno == EINTR)
+					break;
+				log_err("fio: poll: %s\n", strerror(errno));
+				break;
+			} else if (!ret) {
+				if (!block)
+					return 0;
+				continue;
+			}
+
+			if (pfd.revents & POLLIN)
+				break;
+			if (pfd.revents & (POLLERR|POLLHUP)) {
+				ret = 1;
 				break;
 			}
-			parse_jobs_ini(buf, 1, 0);
-			exec_run();
-			reset_fio_state();
+		} while (!exit_backend);
+
+		if (ret < 0)
 			break;
-		} else if (!ret)
+
+		cmd = fio_net_recv_cmd(sk);
+		if (!cmd) {
+			ret = -1;
 			break;
-		if (errno == EAGAIN || errno == EINTR)
+		}
+
+		ret = handle_command(cmd);
+		if (ret)
+			break;
+
+		free(cmd);
+		cmd = NULL;
+	}
+
+	if (cmd)
+		free(cmd);
+
+	return ret;
+}
+
+void fio_server_idle_loop(void)
+{
+	if (server_fd != -1)
+		handle_connection(server_fd, 0);
+}
+
+static int accept_loop(int listen_sk)
+{
+	struct sockaddr_in addr;
+	fio_socklen_t len = sizeof(addr);
+	struct pollfd pfd;
+	int ret, sk, flags, exitval = 0;
+
+	dprint(FD_NET, "server enter accept loop\n");
+
+	flags = fcntl(listen_sk, F_GETFL);
+	flags |= O_NONBLOCK;
+	fcntl(listen_sk, F_SETFL, flags);
+again:
+	pfd.fd = listen_sk;
+	pfd.events = POLLIN;
+	do {
+		ret = poll(&pfd, 1, 100);
+		if (ret < 0) {
+			if (errno == EINTR)
+				break;
+			log_err("fio: poll: %s\n", strerror(errno));
+			goto out;
+		} else if (!ret)
 			continue;
-		break;
+
+		if (pfd.revents & POLLIN)
+			break;
+	} while (!exit_backend);
+
+	if (exit_backend)
+		goto out;
+
+	sk = accept(listen_sk, (struct sockaddr *) &addr, &len);
+	if (sk < 0) {
+		log_err("fio: accept: %s\n", strerror(errno));
+		return -1;
 	}
 
+	dprint(FD_NET, "server: connect from %s\n", inet_ntoa(addr.sin_addr));
+
+	server_fd = sk;
+
+	exitval = handle_connection(sk, 1);
+
+	server_fd = -1;
 	close(sk);
 
-	if (!do_exit)
+	if (!exit_backend)
 		goto again;
 
-	return 0;
+out:
+	return exitval;
+}
+
+int fio_server_text_output(const char *buf, size_t len)
+{
+	if (server_fd != -1)
+		return fio_net_send_cmd(server_fd, FIO_NET_CMD_TEXT, buf, len, 0);
+
+	return log_local_buf(buf, len);
+}
+
+static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
+{
+	dst->max_val	= cpu_to_le64(src->max_val);
+	dst->min_val	= cpu_to_le64(src->min_val);
+	dst->samples	= cpu_to_le64(src->samples);
+
+	/*
+	 * Encode to IEEE 754 for network transfer
+	 */
+	dst->mean.u.i	= __cpu_to_le64(fio_double_to_uint64(src->mean.u.f));
+	dst->S.u.i	= __cpu_to_le64(fio_double_to_uint64(src->S.u.f));
 }
 
-int fio_server(void)
+static void convert_gs(struct group_run_stats *dst, struct group_run_stats *src)
+{
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		dst->max_run[i]		= cpu_to_le64(src->max_run[i]);
+		dst->min_run[i]		= cpu_to_le64(src->min_run[i]);
+		dst->max_bw[i]		= cpu_to_le64(src->max_bw[i]);
+		dst->min_bw[i]		= cpu_to_le64(src->min_bw[i]);
+		dst->io_kb[i]		= cpu_to_le64(src->io_kb[i]);
+		dst->agg[i]		= cpu_to_le64(src->agg[i]);
+	}
+
+	dst->kb_base	= cpu_to_le32(src->kb_base);
+	dst->groupid	= cpu_to_le32(src->groupid);
+}
+
+/*
+ * Send a CMD_TS, which packs struct thread_stat and group_run_stats
+ * into a single payload.
+ */
+void fio_server_send_ts(struct thread_stat *ts, struct group_run_stats *rs)
+{
+	struct cmd_ts_pdu p;
+	int i, j;
+
+	dprint(FD_NET, "server sending end stats\n");
+
+	memset(&p, 0, sizeof(p));
+
+	strcpy(p.ts.name, ts->name);
+	strcpy(p.ts.verror, ts->verror);
+	strcpy(p.ts.description, ts->description);
+
+	p.ts.error	= cpu_to_le32(ts->error);
+	p.ts.groupid	= cpu_to_le32(ts->groupid);
+	p.ts.pid	= cpu_to_le32(ts->pid);
+	p.ts.members	= cpu_to_le32(ts->members);
+
+	for (i = 0; i < 2; i++) {
+		convert_io_stat(&p.ts.clat_stat[i], &ts->clat_stat[i]);
+		convert_io_stat(&p.ts.slat_stat[i], &ts->slat_stat[i]);
+		convert_io_stat(&p.ts.lat_stat[i], &ts->lat_stat[i]);
+		convert_io_stat(&p.ts.bw_stat[i], &ts->bw_stat[i]);
+	}
+
+	p.ts.usr_time		= cpu_to_le64(ts->usr_time);
+	p.ts.sys_time		= cpu_to_le64(ts->sys_time);
+	p.ts.ctx		= cpu_to_le64(ts->ctx);
+	p.ts.minf		= cpu_to_le64(ts->minf);
+	p.ts.majf		= cpu_to_le64(ts->majf);
+	p.ts.clat_percentiles	= cpu_to_le64(ts->clat_percentiles);
+
+	for (i = 0; i < FIO_IO_U_LIST_MAX_LEN; i++) {
+		fio_fp64_t *fp = &p.ts.percentile_list[i];
+
+		fp->u.i = __cpu_to_le64(fio_double_to_uint64(fp->u.f));
+	}
+
+	for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
+		p.ts.io_u_map[i]	= cpu_to_le32(ts->io_u_map[i]);
+		p.ts.io_u_submit[i]	= cpu_to_le32(ts->io_u_submit[i]);
+		p.ts.io_u_complete[i]	= cpu_to_le32(ts->io_u_complete[i]);
+	}
+
+	for (i = 0; i < FIO_IO_U_LAT_U_NR; i++) {
+		p.ts.io_u_lat_u[i]	= cpu_to_le32(ts->io_u_lat_u[i]);
+		p.ts.io_u_lat_m[i]	= cpu_to_le32(ts->io_u_lat_m[i]);
+	}
+
+	for (i = 0; i < 2; i++)
+		for (j = 0; j < FIO_IO_U_PLAT_NR; j++)
+			p.ts.io_u_plat[i][j] = cpu_to_le32(ts->io_u_plat[i][j]);
+
+	for (i = 0; i < 3; i++) {
+		p.ts.total_io_u[i]	= cpu_to_le64(ts->total_io_u[i]);
+		p.ts.short_io_u[i]	= cpu_to_le64(ts->short_io_u[i]);
+	}
+
+	p.ts.total_submit	= cpu_to_le64(ts->total_submit);
+	p.ts.total_complete	= cpu_to_le64(ts->total_complete);
+
+	for (i = 0; i < 2; i++) {
+		p.ts.io_bytes[i]	= cpu_to_le64(ts->io_bytes[i]);
+		p.ts.runtime[i]		= cpu_to_le64(ts->runtime[i]);
+	}
+
+	p.ts.total_run_time	= cpu_to_le64(ts->total_run_time);
+	p.ts.continue_on_error	= cpu_to_le16(ts->continue_on_error);
+	p.ts.total_err_count	= cpu_to_le64(ts->total_err_count);
+	p.ts.first_error	= cpu_to_le32(ts->first_error);
+	p.ts.kb_base		= cpu_to_le32(ts->kb_base);
+
+	convert_gs(&p.rs, rs);
+
+	fio_net_send_cmd(server_fd, FIO_NET_CMD_TS, &p, sizeof(p), 0);
+}
+
+void fio_server_send_gs(struct group_run_stats *rs)
+{
+	struct group_run_stats gs;
+
+	dprint(FD_NET, "server sending group run stats\n");
+
+	convert_gs(&gs, rs);
+	fio_net_send_cmd(server_fd, FIO_NET_CMD_GS, &gs, sizeof(gs), 0);
+}
+
+int fio_server_log(const char *format, ...)
+{
+	char buffer[1024];
+	va_list args;
+	size_t len;
+
+	dprint(FD_NET, "server log\n");
+
+	va_start(args, format);
+	len = vsnprintf(buffer, sizeof(buffer), format, args);
+	va_end(args);
+
+	return fio_server_text_output(buffer, len);
+}
+
+static int fio_init_server_ip(void)
 {
-	struct sockaddr_in saddr_in;
-	struct sockaddr addr;
-	unsigned int len;
 	int sk, opt;
 
 	sk = socket(AF_INET, SOCK_STREAM, 0);
 	if (sk < 0) {
-		log_err("fio: socket\n");
+		log_err("fio: socket: %s\n", strerror(errno));
 		return -1;
 	}
 
 	opt = 1;
 	if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) {
-		log_err("fio: setsockopt\n");
+		log_err("fio: setsockopt: %s\n", strerror(errno));
+		close(sk);
 		return -1;
 	}
 #ifdef SO_REUSEPORT
-	if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt)) < 0) {
-		td_verror(td, errno, "setsockopt");
-		return 1;
+	if (setsockopt(sk, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt)) < 0) {
+		log_err("fio: setsockopt: %s\n", strerror(errno));
+		close(sk);
+		return -1;
 	}
 #endif
 
 	saddr_in.sin_family = AF_INET;
-	saddr_in.sin_addr.s_addr = htonl(INADDR_ANY);
-	saddr_in.sin_port = htons(net_port);
 
 	if (bind(sk, (struct sockaddr *) &saddr_in, sizeof(saddr_in)) < 0) {
-		perror("bind");
-		log_err("fio: bind\n");
+		log_err("fio: bind: %s\n", strerror(errno));
+		close(sk);
 		return -1;
 	}
 
-	if (listen(sk, 1) < 0) {
-		log_err("fio: listen\n");
+	return sk;
+}
+
+static int fio_init_server_sock(void)
+{
+	struct sockaddr_un addr;
+	fio_socklen_t len;
+	mode_t mode;
+	int sk;
+
+	sk = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (sk < 0) {
+		log_err("fio: socket: %s\n", strerror(errno));
 		return -1;
 	}
 
-	len = sizeof(addr);
-	if (getsockname(sk, &addr, &len) < 0) {
-		log_err("fio: getsockname");
+	mode = umask(000);
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	strcpy(addr.sun_path, bind_sock);
+	unlink(bind_sock);
+
+	len = sizeof(addr.sun_family) + strlen(bind_sock) + 1;
+
+	if (bind(sk, (struct sockaddr *) &addr, len) < 0) {
+		log_err("fio: bind: %s\n", strerror(errno));
+		close(sk);
 		return -1;
 	}
 
-	return accept_loop(sk);
+	umask(mode);
+	return sk;
+}
+
+static int fio_init_server_connection(void)
+{
+	char bind_str[128];
+	int sk;
+
+	dprint(FD_NET, "starting server\n");
+
+	if (!bind_sock)
+		sk = fio_init_server_ip();
+	else
+		sk = fio_init_server_sock();
+
+	if (sk < 0)
+		return sk;
+
+	if (!bind_sock)
+		sprintf(bind_str, "%s:%u", inet_ntoa(saddr_in.sin_addr), fio_net_port);
+	else
+		strcpy(bind_str, bind_sock);
+
+	log_info("fio: server listening on %s\n", bind_str);
+
+	if (listen(sk, 0) < 0) {
+		log_err("fio: listen: %s\n", strerror(errno));
+		return -1;
+	}
+
+	return sk;
+}
+
+int fio_server_parse_string(const char *str, char **ptr, int *is_sock,
+			    int *port, struct in_addr *inp)
+{
+	*ptr = NULL;
+	*is_sock = 0;
+	*port = fio_net_port;
+
+	if (!strncmp(str, "sock:", 5)) {
+		*ptr = strdup(str + 5);
+		*is_sock = 1;
+	} else {
+		const char *host = str;
+		char *portp;
+		int lport = 0;
+
+		/*
+		 * Is it ip:<ip or host>:port
+		 */
+		if (!strncmp(host, "ip:", 3))
+			host += 3;
+		else if (host[0] == ':') {
+			/* String is :port */
+			host++;
+			lport = atoi(host);
+			if (!lport || lport > 65535) {
+				log_err("fio: bad server port %u\n", port);
+				return 1;
+			}
+			/* no hostname given, we are done */
+			*port = lport;
+			return 0;
+		}
+
+		/*
+		 * If no port seen yet, check if there's a last ':' at the end
+		 */
+		if (!lport) {
+			portp = strchr(host, ':');
+			if (portp) {
+				*portp = '\0';
+				portp++;
+				lport = atoi(portp);
+				if (!lport || lport > 65535) {
+					log_err("fio: bad server port %u\n", port);
+					return 1;
+				}
+			}
+		}
+
+		if (lport)
+			*port = lport;
+
+		*ptr = strdup(host);
+
+		if (inet_aton(host, inp) != 1) {
+			struct hostent *hent;
+
+			hent = gethostbyname(host);
+			if (!hent) {
+				free(*ptr);
+				*ptr = NULL;
+				return 1;
+			}
+
+			memcpy(inp, hent->h_addr, 4);
+		}
+	}
+
+	if (*port == 0)
+		*port = fio_net_port;
+
+	return 0;
+}
+
+/*
+ * Server arg should be one of:
+ *
+ * sock:/path/to/socket
+ *   ip:1.2.3.4
+ *      1.2.3.4
+ *
+ * Where sock uses unix domain sockets, and ip binds the server to
+ * a specific interface. If no arguments are given to the server, it
+ * uses IP and binds to 0.0.0.0.
+ *
+ */
+static int fio_handle_server_arg(void)
+{
+	int port = fio_net_port;
+	int is_sock, ret = 0;
+
+	saddr_in.sin_addr.s_addr = htonl(INADDR_ANY);
+
+	if (!fio_server_arg)
+		goto out;
+
+	ret = fio_server_parse_string(fio_server_arg, &bind_sock, &is_sock,
+					&port, &saddr_in.sin_addr);
+
+	if (!is_sock && bind_sock) {
+		free(bind_sock);
+		bind_sock = NULL;
+	}
+
+out:
+	fio_net_port = port;
+	saddr_in.sin_port = htons(port);
+	return ret;
+}
+
+static int fio_server(void)
+{
+	int sk, ret;
+
+	dprint(FD_NET, "starting server\n");
+
+	if (fio_handle_server_arg())
+		return -1;
+
+	sk = fio_init_server_connection();
+	if (sk < 0)
+		return -1;
+
+	ret = accept_loop(sk);
+
+	close(sk);
+
+	if (fio_server_arg) {
+		free(fio_server_arg);
+		fio_server_arg = NULL;
+	}
+	if (bind_sock)
+		free(bind_sock);
+
+	return ret;
+}
+
+void fio_server_got_signal(int signal)
+{
+	if (signal == SIGPIPE)
+		server_fd = -1;
+	else {
+		log_info("\nfio: terminating on signal %d\n", signal);
+		exit_backend = 1;
+	}
+}
+
+static int check_existing_pidfile(const char *pidfile)
+{
+	struct stat sb;
+	char buf[16];
+	pid_t pid;
+	FILE *f;
+
+	if (stat(pidfile, &sb))
+		return 0;
+
+	f = fopen(pidfile, "r");
+	if (!f)
+		return 0;
+
+	if (fread(buf, sb.st_size, 1, f) <= 0) {
+		fclose(f);
+		return 1;
+	}
+	fclose(f);
+
+	pid = atoi(buf);
+	if (kill(pid, SIGCONT) < 0)
+		return errno != ESRCH;
+
+	return 1;
+}
+
+static int write_pid(pid_t pid, const char *pidfile)
+{
+	FILE *fpid;
+
+	fpid = fopen(pidfile, "w");
+	if (!fpid) {
+		log_err("fio: failed opening pid file %s\n", pidfile);
+		return 1;
+	}
+
+	fprintf(fpid, "%u\n", (unsigned int) pid);
+	fclose(fpid);
+	return 0;
+}
+
+/*
+ * If pidfile is specified, background us.
+ */
+int fio_start_server(char *pidfile)
+{
+	pid_t pid;
+	int ret;
+
+	if (!pidfile)
+		return fio_server();
+
+	if (check_existing_pidfile(pidfile)) {
+		log_err("fio: pidfile %s exists and server appears alive\n",
+								pidfile);
+		return -1;
+	}
+
+	pid = fork();
+	if (pid < 0) {
+		log_err("fio: failed server fork: %s", strerror(errno));
+		free(pidfile);
+		return -1;
+	} else if (pid) {
+		int ret = write_pid(pid, pidfile);
+
+		exit(ret);
+	}
+
+	setsid();
+	openlog("fio", LOG_NDELAY|LOG_NOWAIT|LOG_PID, LOG_USER);
+	log_syslog = 1;
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+	f_out = NULL;
+	f_err = NULL;
+
+	ret = fio_server();
+
+	closelog();
+	unlink(pidfile);
+	free(pidfile);
+	return ret;
+}
+
+void fio_server_set_arg(const char *arg)
+{
+	fio_server_arg = strdup(arg);
 }