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Hello. I need little help here, please. Actually, this is my first baby step for my process using glib which should work like tail. Actually, when I first wrote a process which open a file, and then move the file postion to the end of the file(G_EEK_END), and then call g_io_add_watch_full to "watch" if there are any appended text at the end of the file, I saw that the g_io_add_watch_full callback called constantly. I confirmed that g_io_add_watch_full works fine with socket. But.. with file descriptor, FYI - this thread is the one which is about the same issue I have - http://www.mail-archive.com/gtk-app-devel-list@xxxxxxxxx/msg10439.html Anyway, so I had to kept moving back to very basic code to see where the problem was. And the below is the very basic code that I wrote to test the "g_io_channel_seek_position(channel, goffset, G_SEEK_END, NULL);" call. But even after g_io_channel_seek_position(channel, goffset, G_SEEK_END, NULL) is called, I see that this little program still print out the first line of the file. If the file position is moved to at the end of file by G_SEEK_END, it shouldn't print out anything, or fail the function call g_io_channel_read_line_string. But again, it prints out the first line of my test file which is text string file. I have no idea what I'm doing wrong. Please give me any adivice if anyone has any idea. Any idea will be helpful. #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <glib.h> // Kernel 2.6.22.9-61, fc6 // cc `pkg-config --cflags --libs glib-2.0` glib_test.c -o glib_test int main() { GIOChannel * channel; GIOFlags gflag; GError *error; GIOStatus status; gint64 goffset; GString *gbuffer; gsize tpos; error = NULL; channel = g_io_channel_new_file("./file.test", "r", &error ); if (error) { printf("file open error: %s\n", error->message); g_error_free(error); exit (0); } gflag = g_io_channel_get_flags(channel); status = g_io_channel_set_flags(channel, gflag|G_IO_FLAG_IS_SEEKABLE, &error); if ( status != G_IO_STATUS_NORMAL ) { printf("g_io_channel_set_flags failed %d\n", status); } g_io_channel_seek_position(channel, goffset, G_SEEK_END, NULL); gbuffer = g_string_new(NULL); g_io_channel_read_line_string(channel, gbuffer, &tpos, NULL); g_printf("%s\n", gbuffer->str); } |
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