client/server: pass type of client to the backend
[fio.git] / server.c
index 5506ca9fedbbb860f7df89b02147d507a0d394ec..89422e96781dae80cd0fad5ec2ed473691820376 100644 (file)
--- a/server.c
+++ b/server.c
 #include "fio.h"
 #include "server.h"
 #include "crc/crc16.h"
-#include "ieee754.h"
+#include "lib/ieee754.h"
 
 #include "fio_version.h"
 
-int fio_net_port = 8765;
+int fio_net_port = FIO_NET_PORT;
 
 int exit_backend = 0;
 
@@ -32,10 +32,44 @@ static int server_fd = -1;
 static char *fio_server_arg;
 static char *bind_sock;
 static struct sockaddr_in saddr_in;
+static struct sockaddr_in6 saddr_in6;
+static int first_cmd_check;
+static int use_ipv6;
+
+static const char *fio_server_ops[FIO_NET_CMD_NR] = {
+       "",
+       "QUIT",
+       "EXIT",
+       "JOB",
+       "JOBLINE",
+       "TEXT",
+       "TS",
+       "GS",
+       "SEND_ETA",
+       "ETA",
+       "PROBE",
+       "START",
+       "STOP",
+       "DISK_UTIL",
+       "SERVER_START",
+       "ADD_JOB",
+       "CMD_RUN"
+};
+
+const char *fio_server_op(unsigned int op)
+{
+       static char buf[32];
+
+       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);
+       assert(len <= sizeof(struct fio_net_cmd) + FIO_SERVER_MAX_FRAGMENT_PDU);
 
        do {
                int ret = send(sk, p, len, 0);
@@ -50,11 +84,16 @@ int fio_send_data(int sk, const void *p, unsigned int len)
                        break;
                else if (errno == EAGAIN || errno == EINTR)
                        continue;
+               else
+                       break;
        } while (!exit_backend);
 
        if (!len)
                return 0;
 
+       if (errno)
+               return -errno;
+
        return 1;
 }
 
@@ -73,6 +112,8 @@ int fio_recv_data(int sk, void *p, unsigned int len)
                        break;
                else if (errno == EAGAIN || errno == EINTR)
                        continue;
+               else
+                       break;
        } while (!exit_backend);
 
        if (!len)
@@ -88,7 +129,7 @@ static int verify_convert_cmd(struct fio_net_cmd *cmd)
        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);
+       crc = fio_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);
@@ -109,7 +150,7 @@ static int verify_convert_cmd(struct fio_net_cmd *cmd)
                return 1;
        }
 
-       if (cmd->pdu_len > FIO_SERVER_MAX_PDU) {
+       if (cmd->pdu_len > FIO_SERVER_MAX_FRAGMENT_PDU) {
                log_err("fio: command payload too large: %u\n", cmd->pdu_len);
                return 1;
        }
@@ -149,8 +190,12 @@ struct fio_net_cmd *fio_net_recv_cmd(int sk)
 
                if (first)
                        memcpy(cmdret, &cmd, sizeof(cmd));
-               else
-                       assert(cmdret->opcode == cmd.opcode);
+               else if (cmdret->opcode != cmd.opcode) {
+                       log_err("fio: fragment opcode mismatch (%d != %d)\n",
+                                       cmdret->opcode, cmd.opcode);
+                       ret = 1;
+                       break;
+               }
 
                if (!cmd.pdu_len)
                        break;
@@ -162,7 +207,7 @@ struct fio_net_cmd *fio_net_recv_cmd(int sk)
                        break;
 
                /* Verify payload crc */
-               crc = crc16(pdu, cmd.pdu_len);
+               crc = fio_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);
@@ -181,12 +226,21 @@ struct fio_net_cmd *fio_net_recv_cmd(int sk)
                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';
+               if (cmdret->pdu_len) {
+                       if (cmdret->opcode == FIO_NET_CMD_TEXT) {
+                               struct cmd_text_pdu *pdu = (struct cmd_text_pdu *) cmdret->payload;
+                               char *buf = (char *) pdu->buf;
+
+                               buf[pdu->buf_len ] = '\0';
+                       } else if (cmdret->opcode == FIO_NET_CMD_JOB) {
+                               struct cmd_job_pdu *pdu = (struct cmd_job_pdu *) cmdret->payload;
+                               char *buf = (char *) pdu->buf;
+                               int len = le32_to_cpu(pdu->buf_len);
+
+                               buf[len] = '\0';
+                       }
                }
+
                /* frag flag is internal */
                cmdret->flags &= ~FIO_NET_CMD_F_MORE;
        }
@@ -198,11 +252,11 @@ 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));
+       cmd->cmd_crc16 = __cpu_to_le16(fio_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));
+               cmd->pdu_crc16 = __cpu_to_le16(fio_crc16(cmd->payload, pdu_len));
 }
 
 int fio_net_send_cmd(int fd, uint16_t opcode, const void *buf, off_t size,
@@ -214,8 +268,8 @@ int fio_net_send_cmd(int fd, uint16_t opcode, const void *buf, off_t size,
 
        do {
                this_len = size;
-               if (this_len > FIO_SERVER_MAX_PDU)
-                       this_len = FIO_SERVER_MAX_PDU;
+               if (this_len > FIO_SERVER_MAX_FRAGMENT_PDU)
+                       this_len = FIO_SERVER_MAX_FRAGMENT_PDU;
 
                if (!cmd || cur_len < sizeof(*cmd) + this_len) {
                        if (cmd)
@@ -243,7 +297,7 @@ int fio_net_send_cmd(int fd, uint16_t opcode, const void *buf, off_t size,
        return ret;
 }
 
-int fio_net_send_simple_cmd(int sk, uint16_t opcode, uint64_t tag)
+static int fio_net_send_simple_stack_cmd(int sk, uint16_t opcode, uint64_t tag)
 {
        struct fio_net_cmd cmd;
 
@@ -253,41 +307,92 @@ int fio_net_send_simple_cmd(int sk, uint16_t opcode, uint64_t tag)
        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, (uintptr_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);
+       return fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_QUIT, 0, NULL);
 }
 
-static int handle_job_cmd(struct fio_net_cmd *cmd)
+static int handle_run_cmd(struct fio_net_cmd *cmd)
 {
-       char *buf = (char *) cmd->payload;
+       struct cmd_end_pdu epdu;
        int ret;
 
-       if (parse_jobs_ini(buf, 1, 0)) {
-               fio_server_send_quit_cmd();
-               return -1;
-       }
+       ret = fio_backend();
 
-       fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_START, 0);
+       epdu.error = ret;
+       fio_net_send_cmd(server_fd, FIO_NET_CMD_STOP, &epdu, sizeof(epdu), 0);
 
-       ret = exec_run();
        fio_server_send_quit_cmd();
        reset_fio_state();
+       first_cmd_check = 0;
        return ret;
 }
 
+static int handle_job_cmd(struct fio_net_cmd *cmd)
+{
+       struct cmd_job_pdu *pdu = (struct cmd_job_pdu *) cmd->payload;
+       void *buf = pdu->buf;
+       struct cmd_start_pdu spdu;
+
+       pdu->buf_len = le32_to_cpu(pdu->buf_len);
+       pdu->client_type = le32_to_cpu(pdu->client_type);
+
+       if (parse_jobs_ini(buf, 1, 0, pdu->client_type)) {
+               fio_server_send_quit_cmd();
+               return -1;
+       }
+
+       spdu.jobs = cpu_to_le32(thread_number);
+       fio_net_send_cmd(server_fd, FIO_NET_CMD_START, &spdu, sizeof(spdu), 0);
+       return 0;
+}
+
 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;
+       struct cmd_start_pdu spdu;
        char **argv;
-       int ret, i;
+       int i;
 
        clp = pdu;
        clp->lines = le16_to_cpu(clp->lines);
+       clp->client_type = le16_to_cpu(clp->client_type);
        argv = malloc(clp->lines * sizeof(char *));
        offset = sizeof(*clp);
 
@@ -301,7 +406,7 @@ static int handle_jobline_cmd(struct fio_net_cmd *cmd)
                dprint(FD_NET, "server: %d: %s\n", i, argv[i]);
        }
 
-       if (parse_cmd_line(clp->lines, argv)) {
+       if (parse_cmd_line(clp->lines, argv, clp->client_type)) {
                fio_server_send_quit_cmd();
                free(argv);
                return -1;
@@ -309,18 +414,17 @@ static int handle_jobline_cmd(struct fio_net_cmd *cmd)
 
        free(argv);
 
-       fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_START, 0);
-
-       ret = exec_run();
-       fio_server_send_quit_cmd();
-       reset_fio_state();
-       return ret;
+       spdu.jobs = cpu_to_le32(thread_number);
+       fio_net_send_cmd(server_fd, FIO_NET_CMD_START, &spdu, sizeof(spdu), 0);
+       return 0;
 }
 
 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
@@ -333,7 +437,9 @@ static int handle_probe_cmd(struct fio_net_cmd *cmd)
        probe.os        = FIO_OS;
        probe.arch      = FIO_ARCH;
 
-       return fio_net_send_cmd(server_fd, FIO_NET_CMD_PROBE, &probe, sizeof(probe), 0);
+       probe.bpp       = sizeof(void *);
+
+       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)
@@ -342,7 +448,10 @@ static int handle_send_eta_cmd(struct fio_net_cmd *cmd)
        size_t size;
        int i;
 
-       size = sizeof(*je) + thread_number * sizeof(char);
+       if (!thread_number)
+               return 0;
+
+       size = sizeof(*je) + thread_number * sizeof(char) + 1;
        je = malloc(size);
        memset(je, 0, size);
 
@@ -357,18 +466,19 @@ static int handle_send_eta_cmd(struct fio_net_cmd *cmd)
        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->m_rate[i]   = cpu_to_le32(je->m_rate[i]);
+               je->t_rate[i]   = cpu_to_le32(je->t_rate[i]);
+               je->m_iops[i]   = cpu_to_le32(je->m_iops[i]);
+               je->t_iops[i]   = cpu_to_le32(je->t_iops[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->elapsed_sec         = cpu_to_le64(je->elapsed_sec);
        je->eta_sec             = cpu_to_le64(je->eta_sec);
+       je->nr_threads          = cpu_to_le32(je->nr_threads);
 
        fio_net_send_cmd(server_fd, FIO_NET_CMD_ETA, je, size, cmd->tag);
        free(je);
@@ -379,7 +489,8 @@ static int handle_command(struct fio_net_cmd *cmd)
 {
        int ret;
 
-       dprint(FD_NET, "server: got opcode %d, pdu=%u\n", cmd->opcode, cmd->pdu_len);
+       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:
@@ -400,8 +511,11 @@ static int handle_command(struct fio_net_cmd *cmd)
        case FIO_NET_CMD_SEND_ETA:
                ret = handle_send_eta_cmd(cmd);
                break;
+       case FIO_NET_CMD_RUN:
+               ret = handle_run_cmd(cmd);
+               break;
        default:
-               log_err("fio: unknown opcode: %d\n", cmd->opcode);
+               log_err("fio: unknown opcode: %s\n",fio_server_op(cmd->opcode));
                ret = 1;
        }
 
@@ -467,6 +581,10 @@ static int handle_connection(int sk, int block)
 
 void fio_server_idle_loop(void)
 {
+       if (!first_cmd_check) {
+               fio_net_send_simple_cmd(server_fd, FIO_NET_CMD_SERVER_START, 0, NULL);
+               first_cmd_check = 1;
+       }
        if (server_fd != -1)
                handle_connection(server_fd, 0);
 }
@@ -525,12 +643,30 @@ out:
        return exitval;
 }
 
-int fio_server_text_output(const char *buf, size_t len)
+int fio_server_text_output(int level, const char *buf, size_t len)
 {
-       if (server_fd != -1)
-               return fio_net_send_cmd(server_fd, FIO_NET_CMD_TEXT, buf, len, 0);
+       struct cmd_text_pdu *pdu;
+       unsigned int tlen;
+       struct timeval tv;
+
+       if (server_fd == -1)
+               return log_local_buf(buf, len);
+
+       tlen = sizeof(*pdu) + len;
+       pdu = malloc(tlen);
+
+       pdu->level      = __cpu_to_le32(level);
+       pdu->buf_len    = __cpu_to_le32(len);
+
+       gettimeofday(&tv, NULL);
+       pdu->log_sec    = __cpu_to_le64(tv.tv_sec);
+       pdu->log_usec   = __cpu_to_le64(tv.tv_usec);
 
-       return log_local_buf(buf, len);
+       memcpy(pdu->buf, buf, len);
+
+       fio_net_send_cmd(server_fd, FIO_NET_CMD_TEXT, pdu, tlen, 0);
+       free(pdu);
+       return len;
 }
 
 static void convert_io_stat(struct io_stat *dst, struct io_stat *src)
@@ -600,9 +736,10 @@ void fio_server_send_ts(struct thread_stat *ts, struct group_run_stats *rs)
        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];
+               fio_fp64_t *src = &ts->percentile_list[i];
+               fio_fp64_t *dst = &p.ts.percentile_list[i];
 
-               fp->u.i = __cpu_to_le64(fio_double_to_uint64(fp->u.f));
+               dst->u.i = __cpu_to_le64(fio_double_to_uint64(src->u.f));
        }
 
        for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
@@ -654,26 +791,81 @@ void fio_server_send_gs(struct group_run_stats *rs)
        fio_net_send_cmd(server_fd, FIO_NET_CMD_GS, &gs, sizeof(gs), 0);
 }
 
-int fio_server_log(const char *format, ...)
+static void convert_agg(struct disk_util_agg *dst, struct disk_util_agg *src)
+{
+       int i;
+
+       for (i = 0; i < 2; i++) {
+               dst->ios[i]     = cpu_to_le32(src->ios[i]);
+               dst->merges[i]  = cpu_to_le32(src->merges[i]);
+               dst->sectors[i] = cpu_to_le64(src->sectors[i]);
+               dst->ticks[i]   = cpu_to_le32(src->ticks[i]);
+       }
+
+       dst->io_ticks           = cpu_to_le32(src->io_ticks);
+       dst->time_in_queue      = cpu_to_le32(src->time_in_queue);
+       dst->slavecount         = cpu_to_le32(src->slavecount);
+       dst->max_util.u.i       = __cpu_to_le64(fio_double_to_uint64(src->max_util.u.f));
+}
+
+static void convert_dus(struct disk_util_stat *dst, struct disk_util_stat *src)
+{
+       int i;
+
+       strcpy((char *) dst->name, (char *) src->name);
+
+       for (i = 0; i < 2; i++) {
+               dst->ios[i]     = cpu_to_le32(src->ios[i]);
+               dst->merges[i]  = cpu_to_le32(src->merges[i]);
+               dst->sectors[i] = cpu_to_le64(src->sectors[i]);
+               dst->ticks[i]   = cpu_to_le32(src->ticks[i]);
+       }
+
+       dst->io_ticks           = cpu_to_le32(src->io_ticks);
+       dst->time_in_queue      = cpu_to_le32(src->time_in_queue);
+       dst->msec               = cpu_to_le64(src->msec);
+}
+
+void fio_server_send_du(void)
 {
-       char buffer[1024];
-       va_list args;
-       size_t len;
+       struct disk_util *du;
+       struct flist_head *entry;
+       struct cmd_du_pdu pdu;
+
+       dprint(FD_NET, "server: sending disk_util %d\n", !flist_empty(&disk_list));
+
+       memset(&pdu, 0, sizeof(pdu));
+
+       flist_for_each(entry, &disk_list) {
+               du = flist_entry(entry, struct disk_util, list);
+
+               convert_dus(&pdu.dus, &du->dus);
+               convert_agg(&pdu.agg, &du->agg);
+
+               fio_net_send_cmd(server_fd, FIO_NET_CMD_DU, &pdu, sizeof(pdu), 0);
+       }
+}
 
-       dprint(FD_NET, "server log\n");
+void fio_server_send_add_job(struct thread_options *o, const char *ioengine)
+{
+       struct cmd_add_job_pdu pdu;
 
-       va_start(args, format);
-       len = vsnprintf(buffer, sizeof(buffer), format, args);
-       va_end(args);
+       convert_thread_options_to_net(&pdu.top, o);
 
-       return fio_server_text_output(buffer, len);
+       fio_net_send_cmd(server_fd, FIO_NET_CMD_ADD_JOB, &pdu, sizeof(pdu), 0);
 }
 
 static int fio_init_server_ip(void)
 {
+       struct sockaddr *addr;
+       fio_socklen_t socklen;
        int sk, opt;
 
-       sk = socket(AF_INET, SOCK_STREAM, 0);
+       if (use_ipv6)
+               sk = socket(AF_INET6, SOCK_STREAM, 0);
+       else
+               sk = socket(AF_INET, SOCK_STREAM, 0);
+
        if (sk < 0) {
                log_err("fio: socket: %s\n", strerror(errno));
                return -1;
@@ -693,9 +885,17 @@ static int fio_init_server_ip(void)
        }
 #endif
 
-       saddr_in.sin_family = AF_INET;
+       if (use_ipv6) {
+               addr = (struct sockaddr *) &saddr_in6;
+               socklen = sizeof(saddr_in6);
+               saddr_in6.sin6_family = AF_INET6;
+       } else {
+               addr = (struct sockaddr *) &saddr_in;
+               socklen = sizeof(saddr_in);
+               saddr_in.sin_family = AF_INET;
+       }
 
-       if (bind(sk, (struct sockaddr *) &saddr_in, sizeof(saddr_in)) < 0) {
+       if (bind(sk, addr, socklen) < 0) {
                log_err("fio: bind: %s\n", strerror(errno));
                close(sk);
                return -1;
@@ -751,14 +951,32 @@ static int fio_init_server_connection(void)
        if (sk < 0)
                return sk;
 
-       if (!bind_sock)
-               sprintf(bind_str, "%s:%u", inet_ntoa(saddr_in.sin_addr), fio_net_port);
-       else
+       if (!bind_sock) {
+               char *p, port[16];
+               const void *src;
+               int af;
+
+               if (use_ipv6) {
+                       af = AF_INET6;
+                       src = &saddr_in6.sin6_addr;
+               } else {
+                       af = AF_INET;
+                       src = &saddr_in.sin_addr;
+               }
+
+               p = (char *) inet_ntop(af, src, bind_str, sizeof(bind_str));
+
+               sprintf(port, ",%u", fio_net_port);
+               if (p)
+                       strcat(p, port);
+               else
+                       strcpy(bind_str, port);
+       } else
                strcpy(bind_str, bind_sock);
 
        log_info("fio: server listening on %s\n", bind_str);
 
-       if (listen(sk, 1) < 0) {
+       if (listen(sk, 0) < 0) {
                log_err("fio: listen: %s\n", strerror(errno));
                return -1;
        }
@@ -766,72 +984,129 @@ static int fio_init_server_connection(void)
        return sk;
 }
 
+int fio_server_parse_host(const char *host, int *ipv6, struct in_addr *inp,
+                         struct in6_addr *inp6)
+
+{
+       int ret = 0;
+
+       if (*ipv6)
+               ret = inet_pton(AF_INET6, host, inp6);
+       else
+               ret = inet_pton(AF_INET, host, inp);
+
+       if (ret != 1) {
+               struct hostent *hent;
+
+               hent = gethostbyname(host);
+               if (!hent) {
+                       log_err("fio: failed to resolve <%s>\n", host);
+                       return 0;
+               }
+
+               if (*ipv6) {
+                       if (hent->h_addrtype != AF_INET6) {
+                               log_info("fio: falling back to IPv4\n");
+                               *ipv6 = 0;
+                       } else
+                               memcpy(inp6, hent->h_addr_list[0], 16);
+               }
+               if (!*ipv6) {
+                       if (hent->h_addrtype != AF_INET) {
+                               log_err("fio: lookup type mismatch\n");
+                               return 0;
+                       }
+                       memcpy(inp, hent->h_addr_list[0], 4);
+               }
+               ret = 1;
+       }
+
+       return !(ret == 1);
+}
+
+/*
+ * Parse a host/ip/port string. Reads from 'str'.
+ *
+ * Outputs:
+ *
+ * For IPv4:
+ *     *ptr is the host, *port is the port, inp is the destination.
+ * For IPv6:
+ *     *ptr is the host, *port is the port, inp6 is the dest, and *ipv6 is 1.
+ * For local domain sockets:
+ *     *ptr is the filename, *is_sock is 1.
+ */
 int fio_server_parse_string(const char *str, char **ptr, int *is_sock,
-                           int *port, struct in_addr *inp)
+                           int *port, struct in_addr *inp,
+                           struct in6_addr *inp6, int *ipv6)
 {
+       const char *host = str;
+       char *portp;
+       int lport = 0;
+
        *ptr = NULL;
        *is_sock = 0;
        *port = fio_net_port;
+       *ipv6 = 0;
 
        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);
+
+               return 0;
+       }
+
+       /*
+        * Is it ip:<ip or host>:port
+        */
+       if (!strncmp(host, "ip:", 3))
+               host += 3;
+       else if (!strncmp(host, "ip4:", 4))
+               host += 4;
+       else if (!strncmp(host, "ip6:", 4)) {
+               host += 4;
+               *ipv6 = 1;
+       } 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;
                        }
-                       /* 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 (lport)
+               *port = lport;
 
-               if (inet_aton(host, inp) != 1) {
-                       struct hostent *hent;
+       if (!strlen(host))
+               return 0;
 
-                       hent = gethostbyname(host);
-                       if (!hent) {
-                               free(*ptr);
-                               *ptr = NULL;
-                               return 1;
-                       }
+       *ptr = strdup(host);
 
-                       memcpy(inp, hent->h_addr, 4);
-               }
+       if (fio_server_parse_host(*ptr, ipv6, inp, inp6)) {
+               free(*ptr);
+               *ptr = NULL;
+               return 1;
        }
 
        if (*port == 0)
@@ -863,7 +1138,8 @@ static int fio_handle_server_arg(void)
                goto out;
 
        ret = fio_server_parse_string(fio_server_arg, &bind_sock, &is_sock,
-                                       &port, &saddr_in.sin_addr);
+                                       &port, &saddr_in.sin_addr,
+                                       &saddr_in6.sin6_addr, &use_ipv6);
 
        if (!is_sock && bind_sock) {
                free(bind_sock);
@@ -873,6 +1149,7 @@ static int fio_handle_server_arg(void)
 out:
        fio_net_port = port;
        saddr_in.sin_port = htons(port);
+       saddr_in6.sin6_port = htons(port);
        return ret;
 }
 
@@ -903,25 +1180,14 @@ static int fio_server(void)
        return ret;
 }
 
-static void sig_int(int sig)
+void fio_server_got_signal(int signal)
 {
-       fio_terminate_threads(TERMINATE_ALL);
-       exit_backend = 1;
-}
-
-static void server_signal_handler(void)
-{
-       struct sigaction act;
-
-       memset(&act, 0, sizeof(act));
-       act.sa_handler = sig_int;
-       act.sa_flags = SA_RESTART;
-       sigaction(SIGINT, &act, NULL);
-
-       memset(&act, 0, sizeof(act));
-       act.sa_handler = sig_int;
-       act.sa_flags = SA_RESTART;
-       sigaction(SIGTERM, &act, NULL);
+       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)
@@ -946,7 +1212,7 @@ static int check_existing_pidfile(const char *pidfile)
 
        pid = atoi(buf);
        if (kill(pid, SIGCONT) < 0)
-               return 0;
+               return errno != ESRCH;
 
        return 1;
 }
@@ -974,7 +1240,10 @@ int fio_start_server(char *pidfile)
        pid_t pid;
        int ret;
 
-       server_signal_handler();
+#if defined(WIN32)
+       WSADATA wsd;
+       WSAStartup(MAKEWORD(2,2), &wsd);
+#endif
 
        if (!pidfile)
                return fio_server();