*/
/** \file signal.c signal handling functions */
+
+
#include "para.h"
+#include "fd.h"
+
+#include <signal.h>
+
#include "error.h"
static int signal_pipe[2];
/**
* initialize the paraslash signal subsystem
*
- * This function creates a pipe, the signal pipe, to deliver pending signals to
- * the application. It should be called during the application's startup part,
- * followed by subsequent calls to para_install_sighandler() for each signal
- * that should be caught.
+ * This function creates a pipe, the signal pipe, to deliver pending
+ * signals to the application (Bernstein's trick). It should be called
+ * during the application's startup part, followed by subsequent calls
+ * to para_install_sighandler() for each signal that should be caught.
*
* para_signal_init() installs a generic signal handler which is used for all
* signals simultaneously. When a signal arrives, this generic signal handler
*/
int para_signal_init(void)
{
- if (!pipe(signal_pipe))
- return signal_pipe[0];
- PARA_EMERG_LOG("%s", "pipe error: Can not setup signal pipe");
+ int ret = -E_SIGNAL_PIPE;
+ if (pipe(signal_pipe))
+ goto err_out;
+ ret = mark_fd_nonblock(signal_pipe[0]);
+ if (ret < 0)
+ goto err_out;
+ ret = mark_fd_nonblock(signal_pipe[1]);
+ if (ret < 0)
+ goto err_out;
+ return signal_pipe[0];
+err_out:
+ PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
exit(EXIT_FAILURE);
}
if (pid <= 0) {
if (pid < 0)
pid = -E_WAITPID;
- return 0;
+ return pid;
}
if (WIFEXITED(status))
PARA_DEBUG_LOG("child %i exited. Exit status: %i\n", pid,