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cope with SIGIO behaviour

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SIGIO appears to be edge triggered, therefore we need to read
continuously until no more data is available
This commit is contained in:
Ludwig Ortmann 2013-11-08 13:16:08 +01:00
parent 2c7070bf0c
commit 1df56ed47b
1 changed files with 28 additions and 1 deletions
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29
cpu/native/net/tap.c
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@ -23,6 +23,7 @@
#include <fcntl.h>
#include <arpa/inet.h>
#include <inttypes.h>
#include <errno.h>
#ifdef __MACH__
#define _POSIX_C_SOURCE
@ -87,9 +88,35 @@ void _native_handle_tap_input(void)
else {
DEBUG("ignoring non-native frame\n");
}
/* work around lost signals */
fd_set rfds;
struct timeval t;
memset(&t, 0, sizeof(t));
FD_ZERO(&rfds);
FD_SET(_native_tap_fd, &rfds);
_native_in_syscall++; // no switching here
if (select(_native_tap_fd +1, &rfds, NULL, NULL, &t) == 1) {
int sig = SIGIO;
extern int _sig_pipefd[2];
extern ssize_t (*real_write)(int fd, const void *buf, size_t count);
real_write(_sig_pipefd[1], &sig, sizeof(int));
_native_sigpend++;
DEBUG("_native_handle_tap_input: sigpend++\n");
}
else {
DEBUG("_native_handle_tap_input: no more pending tap data\n");
}
_native_in_syscall--;
}
else if (nread == -1) {
err(EXIT_FAILURE, "read");
if ((errno == EAGAIN ) || (errno == EWOULDBLOCK)) {
//warn("read");
}
else {
err(EXIT_FAILURE, "_native_handle_tap_input: read");
}
}
else {
errx(EXIT_FAILURE, "internal error _native_handle_tap_input");