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| 03:42.43 | chrisf_ | hi #elinux; im trying to detect when a usb stick is plugged into my device, from C. |
| 03:42.47 | chrisf_ | is there a sane way of doing this? |
| 03:56.58 | MonMotha | chrisf_: have udev fire off some sort of indication |
| 03:57.07 | chrisf_ | no udev. |
| 03:57.07 | MonMotha | easiest way is to just signal your process with e.g. SIGUSR1 |
| 03:57.19 | MonMotha | that makes this much, much harder |
| 03:57.25 | MonMotha | I guess poll sysfs |
| 03:57.41 | MonMotha | you may be able to hook into the same kernel hooks as udev uses, but I'm not sure that's worth the effort |
| 03:58.02 | MonMotha | this is the sort of thing udev is designed to handle |
| 03:58.28 | MonMotha | in theory, hald takes care of all this stuff via dbus, but that's far more complicated than most embedded systems desire |
| 03:58.42 | chrisf_ | hell yes. |
| 03:59.04 | chrisf_ | no way im going to be running dbus on here. |
| 03:59.08 | MonMotha | the system I built that did exactly what you ask used udev to signal the "big app" upon insert/remove |
| 03:59.15 | MonMotha | it worked very well |
| 03:59.24 | MonMotha | though I don't think it handled multiple USB sticks at once |
| 03:59.31 | MonMotha | easily could have, though |
| 03:59.55 | chrisf_ | ive only got one port; if someone sticks a hub on it, that's their own dumb fault that it doesnt work :) |
| 04:00.20 | MonMotha | if you monitor the entries in /sys/block, you should be able to see sd? appear |
| 04:00.26 | MonMotha | that should be your USB stick |
| 04:01.43 | chrisf_ | i can indeed see that. |
| 04:02.04 | MonMotha | that seems kinda ugly |
| 04:02.06 | chrisf_ | *tries with the other flavor (partitioned)* |
| 04:02.30 | MonMotha | though you should be able to use poll(2) on the directory |
| 04:02.57 | chrisf_ | can i use select(2) ? |
| 04:03.01 | MonMotha | maybe |
| 04:03.05 | MonMotha | I've not done this before |
| 04:03.08 | MonMotha | I mostly do hardware |
| 04:03.30 | chrisf_ | i dont like poll(2) for highly-dynamic event sets |
| 04:04.25 | chrisf_ | yes, it has fairness advantages and whatever, but its a pain to maintain a persistent list that's always changing.. and if i have to rebuild from scratch every time, i may as well use select since its easier. |
| 04:07.32 | MonMotha | you should be able to open a file descriptor on /sys/block, but I'm not sure if poll or select will allow you to wait for entries to appear/disappear |
| 04:07.43 | chrisf_ | hmmn |
| 04:07.44 | MonMotha | just not something I've looked into before |
| 04:07.47 | MonMotha | udev makes this very easy |
| 04:07.51 | chrisf_ | i can always poll it. |
| 04:08.08 | chrisf_ | opendir()... is there something cool? |
| 04:08.13 | chrisf_ | etc. |
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| 04:31.02 | chrisf_ | *done* |
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| 06:50.38 | methril|work | yo |
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| 18:31.40 | flavioribeiro | someone can tell me a board that supports embedded linux and have GPS\GPRS? |
| 18:44.01 | roxfan | iphone? >.> |
| 18:44.37 | roxfan | anyway, there are plenty of gps and gprs modules which only need a serial port |
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