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nerves_runtime

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Small, general runtime utilities for Nerves devices

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nerves_runtime src kmsg_tailer.c
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src/kmsg_tailer.c 

#include <err.h>

#include <fcntl.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <unistd.h>



#define KMSG_PATH "/proc/kmsg"

#define BUFFER_SIZE 4096



static char buffer[BUFFER_SIZE];



int main(int argc, char *argv[])

{

    int fd = open(KMSG_PATH, O_RDONLY);

    if (fd < 0)

        err(EXIT_FAILURE, "open %s", KMSG_PATH);



    for (;;) {

        ssize_t amt = read(fd, buffer, sizeof(buffer));

        if (amt < 0)

            err(EXIT_FAILURE, "%s: read", argv[1]);



        if (write(STDOUT_FILENO, buffer, amt) < 0)

            err(EXIT_FAILURE, "%s: write", argv[1]);

    }

}