diff options
author | Kenneth G Raeburn <raeburn@mit.edu> | 1991-03-21 07:05:21 +0000 |
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committer | Kenneth G Raeburn <raeburn@mit.edu> | 1991-03-21 07:05:21 +0000 |
commit | b3bdf359c6466abd7d18867be8bb3e0e21f3c887 (patch) | |
tree | e9e063a97a9f45d35898e1f6f64f8f55100f3efc /lib/ZWait4Not.c | |
parent | e3ebca76c257ff8b8e8ef7c53fbbf7ce94a1facc (diff) |
Initial revision
Diffstat (limited to 'lib/ZWait4Not.c')
-rw-r--r-- | lib/ZWait4Not.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/ZWait4Not.c b/lib/ZWait4Not.c new file mode 100644 index 0000000..c550ae0 --- /dev/null +++ b/lib/ZWait4Not.c @@ -0,0 +1,75 @@ +/* This file is part of the Project Athena Zephyr Notification System. + * It contains the ZCheckIfNotice/select loop used for waiting for + * a notice, with a timeout. + * + * Created by: <Joe Random Hacker> + * + * $Source$ + * $Author$ + * + * Copyright (c) 1991 by the Massachusetts Institute of Technology. + * For copying and distribution information, see the file + * "mit-copyright.h". + */ + +#include <zephyr/mit-copyright.h> + +#ifndef lint +static char rcsid_ZWaitForNotice_c[] = + "$Zephyr$"; +#endif + +#include <zephyr/zephyr.h> +#ifdef _AIX +#include <sys/select.h> +#endif + +Code_t +Z_WaitForNotice (notice, pred, uid, timeout) + ZNotice_t *notice; + int (*pred) (); + ZUnique_Id_t *uid; + int timeout; +{ + Code_t retval; + struct timeval tv, t0; + fd_set fdmask; + int i, fd; + + retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred, + (char *) uid); + if (retval == ZERR_NONE) + return ZERR_NONE; + if (retval != ZERR_NONOTICE) + return retval; + + fd = ZGetFD (); + FD_ZERO (&fdmask); + tv.tv_sec = timeout; + tv.tv_usec = 0; + gettimeofday (&t0, (struct timezone *) 0); + t0.tv_sec += timeout; + while (1) { + FD_SET (fd, &fdmask); + i = select (fd + 1, &fdmask, (fd_set *) 0, (fd_set *) 0, &tv); + if (i == 0) + return ETIMEDOUT; + if (i < 0 && errno != EINTR) + return errno; + if (i > 0) { + retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred, + (char *) uid); + if (retval != ZERR_NONOTICE) /* includes ZERR_NONE */ + return retval; + } + gettimeofday (&tv, (struct timezone *) 0); + tv.tv_usec = t0.tv_usec - tv.tv_usec; + if (tv.tv_usec < 0) { + tv.tv_usec += 1000000; + tv.tv_sec = t0.tv_sec - tv.tv_sec - 1; + } + else + tv.tv_sec = t0.tv_sec - tv.tv_sec; + } + /*NOTREACHED*/ +} |