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author | msweet <msweet@a1ca3aef-8c08-0410-bb20-df032aa958be> | 2011-02-25 01:40:44 +0000 |
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committer | msweet <msweet@a1ca3aef-8c08-0410-bb20-df032aa958be> | 2011-02-25 01:40:44 +0000 |
commit | c8fef167ba1e9d5d87fc77e4e99ca12ba9384cbb (patch) | |
tree | b96b096d1eacae0e337b3ab3d16aa2652a5bf07f /backend/runloop.c | |
parent | e60ec91f3e2a38a90f17ee193db32f5c6bef27ed (diff) | |
download | cups-c8fef167ba1e9d5d87fc77e4e99ca12ba9384cbb.tar.gz |
Merge changes from CUPS 1.5svn-r9567
git-svn-id: svn+ssh://src.apple.com/svn/cups/easysw/current@3015 a1ca3aef-8c08-0410-bb20-df032aa958be
Diffstat (limited to 'backend/runloop.c')
-rw-r--r-- | backend/runloop.c | 125 |
1 files changed, 112 insertions, 13 deletions
diff --git a/backend/runloop.c b/backend/runloop.c index 2f5b5eaee..fbc5a467f 100644 --- a/backend/runloop.c +++ b/backend/runloop.c @@ -1,9 +1,9 @@ /* - * "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $" + * "$Id: runloop.c 9565 2011-02-23 00:08:08Z mike $" * - * Common run loop APIs for CUPS. + * Common run loop APIs for CUPS backends. * - * Copyright 2007-2010 by Apple Inc. + * Copyright 2007-2011 by Apple Inc. * Copyright 2006-2007 by Easy Software Products, all rights reserved. * * These coded instructions, statements, and computer programs are the @@ -18,6 +18,8 @@ * * backendDrainOutput() - Drain pending print data to the device. * backendRunLoop() - Read and write print and back-channel data. + * backendWaitLoop() - Wait for input from stdin while handling + * side-channel queries. */ /* @@ -141,14 +143,13 @@ backendDrainOutput(int print_fd, /* I - Print file descriptor */ ssize_t /* O - Total bytes on success, -1 on error */ backendRunLoop( - int print_fd, /* I - Print file descriptor */ - int device_fd, /* I - Device file descriptor */ - int snmp_fd, /* I - SNMP socket or -1 if none */ - http_addr_t *addr, /* I - Address of device */ - int use_bc, /* I - Use back-channel? */ - int update_state, /* I - Update printer-state-reasons? */ - int (*side_cb)(int, int, int, http_addr_t *, int)) - /* I - Side-channel callback */ + int print_fd, /* I - Print file descriptor */ + int device_fd, /* I - Device file descriptor */ + int snmp_fd, /* I - SNMP socket or -1 if none */ + http_addr_t *addr, /* I - Address of device */ + int use_bc, /* I - Use back-channel? */ + int update_state, /* I - Update printer-state-reasons? */ + _cups_sccb_t side_cb) /* I - Side-channel callback */ { int nfds; /* Maximum file descriptor value + 1 */ fd_set input, /* Input set for reading */ @@ -255,7 +256,7 @@ backendRunLoop( else if (errno == EINTR && total_bytes == 0) { fputs("DEBUG: Received an interrupt before any bytes were " - "written, aborting\n", stderr); + "written, aborting.\n", stderr); return (0); } @@ -422,5 +423,103 @@ backendRunLoop( /* - * End of "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $". + * 'backendWaitLoop()' - Wait for input from stdin while handling side-channel + * queries. + */ + +int /* O - 1 if data is ready, 0 if not */ +backendWaitLoop( + int snmp_fd, /* I - SNMP socket or -1 if none */ + http_addr_t *addr, /* I - Address of device */ + _cups_sccb_t side_cb) /* I - Side-channel callback */ +{ + fd_set input; /* Input set for reading */ + time_t curtime, /* Current time */ + snmp_update = 0; +#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) + struct sigaction action; /* Actions for POSIX signals */ +#endif /* HAVE_SIGACTION && !HAVE_SIGSET */ + + + fprintf(stderr, "DEBUG: backendWaitLoop(snmp_fd=%d, addr=%p, side_cb=%p)\n", + snmp_fd, addr, side_cb); + + /* + * Now loop until we receive data from stdin... + */ + + for (;;) + { + /* + * Use select() to determine whether we have data to copy around... + */ + + FD_ZERO(&input); + FD_SET(0, &input); + if (side_cb) + FD_SET(CUPS_SC_FD, &input); + + if (select(CUPS_SC_FD + 1, &input, NULL, NULL, NULL) < 0) + { + /* + * Pause printing to clear any pending errors... + */ + + if (errno == EINTR) + { + fputs("DEBUG: Received an interrupt before any bytes were " + "written, aborting.\n", stderr); + return (0); + } + + sleep(1); + continue; + } + + /* + * Check for input on stdin... + */ + + if (FD_ISSET(0, &input)) + break; + + /* + * Check if we have a side-channel request ready... + */ + + if (side_cb && FD_ISSET(CUPS_SC_FD, &input)) + { + /* + * Do the side-channel request, then start back over in the select + * loop since it may have read from print_fd... + */ + + if ((*side_cb)(0, -1, snmp_fd, addr, 0)) + side_cb = NULL; + continue; + } + + /* + * Do SNMP updates periodically... + */ + + if (snmp_fd >= 0 && time(&curtime) >= snmp_update) + { + if (backendSNMPSupplies(snmp_fd, addr, NULL, NULL)) + snmp_update = INT_MAX; + else + snmp_update = curtime + 5; + } + } + + /* + * Return with success... + */ + + return (1); +} + + +/* + * End of "$Id: runloop.c 9565 2011-02-23 00:08:08Z mike $". */ |