Move termination signal handing from main into iperf_run_client

and iperf_run_server, so that API users get it too.  Also, call
iperf_errexit with an appropriate message, which in -J mode dumps
out any accumulated JSON data.

src/iperf_api.c

@@ -47,8 +47,6 @@
 #include "iperf_util.h"
 #include "locale.h"
 
-jmp_buf env;            /* to handle longjmp on signal */
-
 
 /* Forwards. */
 static int send_parameters(struct iperf_test *test);
@@ -2109,12 +2107,27 @@ diskfile_recv(struct iperf_stream *sp)
     return r;
 }
 
+
 void
-sig_handler(int sig)
+iperf_catch_sigend(void (*handler)(int))
 {
-   longjmp(env, 1); 
+    signal(SIGINT, handler);
+    signal(SIGTERM, handler);
+    signal(SIGHUP, handler);
 }
 
+void
+iperf_got_sigend(struct iperf_test *test)
+{
+    if (test->ctrl_sck >= 0) {
+	test->state = (test->role == 'c') ? CLIENT_TERMINATE : SERVER_TERMINATE;
+	(void) Nwrite(test->ctrl_sck, (char*) &test->state, sizeof(signed char), Ptcp);
+    }
+    i_errno = (test->role == 'c') ? IECLIENTTERM : IESERVERTERM;
+    iperf_errexit(test, "interrupt - %s", iperf_strerror(i_errno));
+}
+
+
 int
 iperf_json_start(struct iperf_test *test)
 {

src/iperf_api.h

@@ -169,7 +169,8 @@ int iperf_set_send_state(struct iperf_test *test, char state);
 void iperf_check_throttle(struct iperf_stream *sp, struct timeval *nowP);
 int iperf_send(struct iperf_test *, fd_set *) /* __attribute__((hot)) */;
 int iperf_recv(struct iperf_test *, fd_set *);
-void sig_handler(int);
+void iperf_catch_sigend(void (*handler)(int));
+void iperf_got_sigend(struct iperf_test *test) __attribute__ ((noreturn));
 void usage();
 void usage_long();
 void warning(char *);

src/iperf_client_api.c

@@ -300,6 +300,15 @@ sigalrm_handler(int sig)
 }
 
 
+static jmp_buf sigend_jmp_buf;
+
+static void
+sigend_handler(int sig)
+{
+    longjmp(sigend_jmp_buf, 1);
+}
+
+
 int
 iperf_run_client(struct iperf_test * test)
 {
@@ -311,6 +320,11 @@ iperf_run_client(struct iperf_test * test)
     fd_set read_set, write_set;
     struct timeval now;
 
+    /* Termination signals. */
+    iperf_catch_sigend(sigend_handler);
+    if (setjmp(sigend_jmp_buf))
+	iperf_got_sigend(test);
+
     if (test->affinity != -1)
 	if (iperf_setaffinity(test->affinity) != 0)
 	    return -1;

src/iperf_server_api.c

@@ -330,6 +330,16 @@ cleanup_server(struct iperf_test *test)
     close(test->listener);
 }
 
+
+static jmp_buf sigend_jmp_buf;
+
+static void
+sigend_handler(int sig)
+{
+    longjmp(sigend_jmp_buf, 1);
+}
+
+
 int
 iperf_run_server(struct iperf_test *test)
 {
@@ -338,6 +348,11 @@ iperf_run_server(struct iperf_test *test)
     struct iperf_stream *sp;
     struct timeval now;
 
+    /* Termination signals. */
+    iperf_catch_sigend(sigend_handler);
+    if (setjmp(sigend_jmp_buf))
+	iperf_got_sigend(test);
+
     if (test->affinity != -1) 
 	if (iperf_setaffinity(test->affinity) != 0)
 	    return -1;

src/main.c

@@ -30,10 +30,10 @@
 #include "net.h"
 
 
-int iperf_run(struct iperf_test *);
+static int run(struct iperf_test *test);
+
 
 /**************************************************************************/
-
 int
 main(int argc, char **argv)
 {
@@ -81,19 +81,6 @@ main(int argc, char **argv)
     /* This main program doesn't use SIGALRM, so the iperf API may use it. */
     iperf_set_test_may_use_sigalrm(test, 1);
 
-    // XXX: Check signal for errors?
-    signal(SIGINT, sig_handler);
-    if (setjmp(env)) {
-        if (test->ctrl_sck >= 0) {
-            test->state = (test->role == 'c') ? CLIENT_TERMINATE : SERVER_TERMINATE;
-            if (Nwrite(test->ctrl_sck, (char*) &test->state, sizeof(signed char), Ptcp) < 0) {
-                i_errno = IESENDMESSAGE;
-                return -1;
-            }
-        }
-        exit(1);
-    } 
-
     if (iperf_parse_arguments(test, argc, argv) < 0) {
         iperf_err(test, "parameter error - %s", iperf_strerror(i_errno));
         fprintf(stderr, "\n");
@@ -101,7 +88,7 @@ main(int argc, char **argv)
         exit(1);
     }
 
-    if (iperf_run(test) < 0)
+    if (run(test) < 0)
         iperf_errexit(test, "error - %s", iperf_strerror(i_errno));
 
     iperf_free_test(test);
@@ -110,8 +97,8 @@ main(int argc, char **argv)
 }
 
 /**************************************************************************/
-int
-iperf_run(struct iperf_test * test)
+static int
+run(struct iperf_test *test)
 {
     int consecutive_errors;