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preinit: pause before exiting

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as explained in the comment, this is to give us a
chance to see error messages before the kernel panics
This commit is contained in:
Daniel Barlow 2023-11-04 23:56:05 +00:00
parent 86a5224f3c
commit 6db982f25f
1 changed files with 16 additions and 0 deletions
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16
pkgs/preinit/preinit.c
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@ -15,6 +15,21 @@ void parseopts(char * cmdline, char **root, char **rootfstype);
#define ERR(x) write(2, x, strlen(x))
#define AVER(c) do { if(c < 0) ERR("failed: " #c); } while(0)
static void die() {
/* if init exits, it causes a kernel panic. On the Turris
* Omnia (and maybe other hardware, I don't know), the kernel
* panics _before_ any of the messages from AVER are printed,
* which makes it really hard to tell what went wrong. So
* let's wait a little here to give the console a chance to
* catch up.
*
* Yes, I know that file descriptor IO is supposedly
* non-buffered. Empirical observation suggests that there
* must be a buffer of some kind somewhere though.
*/
sleep(10);
exit(1);
}
static int fork_exec(char * command, char *args[])
@ -78,4 +93,5 @@ int main(int argc, char *argv[], char *envp[])
argv[1] = NULL;
AVER(execve("/persist/init", argv, envp));
}
die();
}