[Xenomai-git] Philippe Gerum : testsuite/gpio: illustrate select() + read() combination

[git repository hosting]

Module: xenomai-3
Branch: wip/drivers
Commit: 47a8001c4727dd181668951204cf7e23a1bc6aec
URL:    
http://git.xenomai.org/?p=xenomai-3.git;a=commit;h=47a8001c4727dd181668951204cf7e23a1bc6aec

Author: Philippe Gerum <r...@xenomai.org>
Date:   Tue Jul 12 10:03:48 2016 +0200

testsuite/gpio: illustrate select() + read() combination

---

 testsuite/gpiotest/gpiotest.c |   24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/testsuite/gpiotest/gpiotest.c b/testsuite/gpiotest/gpiotest.c
index 6e9ce5b..aeb16af 100644
--- a/testsuite/gpiotest/gpiotest.c
+++ b/testsuite/gpiotest/gpiotest.c
@@ -32,6 +32,7 @@
 smokey_test_plugin(interrupt,
                   SMOKEY_ARGLIST(
                           SMOKEY_STRING(device),
+                          SMOKEY_BOOL(select),
                   ),
    "Wait for interrupts from a GPIO pin.\n"
    "\tdevice=<device-path>."
@@ -68,8 +69,8 @@ static int run_interrupt(struct smokey_test *t, int argc, 
char *const argv[])
                { .name = "level-high", .flag = GPIO_TRIGGER_LEVEL_HIGH },
                { NULL, 0 },
        };
+       int do_select = 0, fd, ret, trigger, n, value;
        const char *device = NULL, *trigname;
-       int fd, ret, trigger, n;
        fd_set set;
        
        smokey_parse_args(t, argc, argv);
@@ -88,6 +89,9 @@ static int run_interrupt(struct smokey_test *t, int argc, 
char *const argv[])
                return ret;
        }
 
+       if (SMOKEY_ARG_ISSET(interrupt, select))
+               do_select = SMOKEY_ARG_BOOL(interrupt, select);
+
        trigger = GPIO_TRIGGER_NONE;
        if (SMOKEY_ARG_ISSET(interrupt, trigger)) {
                trigname = SMOKEY_ARG_STRING(interrupt, trigger);
@@ -115,13 +119,23 @@ static int run_interrupt(struct smokey_test *t, int argc, 
char *const argv[])
        FD_SET(fd, &set);
        
        for (;;) {
-               ret = select(fd + 1, &set, NULL, NULL, NULL);
+               if (do_select) {
+                       ret = select(fd + 1, &set, NULL, NULL, NULL);
+                       if (ret < 0) {
+                               ret = -errno;
+                               warning("failed listening to %s [%s]",
+                                       device, symerror(ret));
+                               return ret;
+                       }
+               }
+               ret = read(fd, &value, sizeof(value));
                if (ret < 0) {
                        ret = -errno;
-                       warning("failed listening to %s [%s]",
+                       warning("failed reading from %s [%s]",
                                device, symerror(ret));
+                       return ret;
                }
-               printf("kick %d!\n", ret);
+               printf("received irq, GPIO state=%d\n", value);
        }
 
        close(fd);
@@ -142,7 +156,7 @@ static int run_read_value(struct smokey_test *t, int argc, 
char *const argv[])
        }
 
        device = SMOKEY_ARG_STRING(read_value, device);
-       fd = open(device, O_RDONLY);
+       fd = open(device, O_RDONLY|O_NONBLOCK);
        if (fd < 0) {
                ret = -errno;
                warning("cannot open device %s [%s]",


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