Annotation of embedaddon/nginx/src/os/unix/ngx_channel.c, revision 1.1
1.1 ! misho 1:
! 2: /*
! 3: * Copyright (C) Igor Sysoev
! 4: * Copyright (C) Nginx, Inc.
! 5: */
! 6:
! 7:
! 8: #include <ngx_config.h>
! 9: #include <ngx_core.h>
! 10: #include <ngx_channel.h>
! 11:
! 12:
! 13: ngx_int_t
! 14: ngx_write_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
! 15: ngx_log_t *log)
! 16: {
! 17: ssize_t n;
! 18: ngx_err_t err;
! 19: struct iovec iov[1];
! 20: struct msghdr msg;
! 21:
! 22: #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
! 23:
! 24: union {
! 25: struct cmsghdr cm;
! 26: char space[CMSG_SPACE(sizeof(int))];
! 27: } cmsg;
! 28:
! 29: if (ch->fd == -1) {
! 30: msg.msg_control = NULL;
! 31: msg.msg_controllen = 0;
! 32:
! 33: } else {
! 34: msg.msg_control = (caddr_t) &cmsg;
! 35: msg.msg_controllen = sizeof(cmsg);
! 36:
! 37: cmsg.cm.cmsg_len = CMSG_LEN(sizeof(int));
! 38: cmsg.cm.cmsg_level = SOL_SOCKET;
! 39: cmsg.cm.cmsg_type = SCM_RIGHTS;
! 40:
! 41: /*
! 42: * We have to use ngx_memcpy() instead of simple
! 43: * *(int *) CMSG_DATA(&cmsg.cm) = ch->fd;
! 44: * because some gcc 4.4 with -O2/3/s optimization issues the warning:
! 45: * dereferencing type-punned pointer will break strict-aliasing rules
! 46: *
! 47: * Fortunately, gcc with -O1 compiles this ngx_memcpy()
! 48: * in the same simple assignment as in the code above
! 49: */
! 50:
! 51: ngx_memcpy(CMSG_DATA(&cmsg.cm), &ch->fd, sizeof(int));
! 52: }
! 53:
! 54: msg.msg_flags = 0;
! 55:
! 56: #else
! 57:
! 58: if (ch->fd == -1) {
! 59: msg.msg_accrights = NULL;
! 60: msg.msg_accrightslen = 0;
! 61:
! 62: } else {
! 63: msg.msg_accrights = (caddr_t) &ch->fd;
! 64: msg.msg_accrightslen = sizeof(int);
! 65: }
! 66:
! 67: #endif
! 68:
! 69: iov[0].iov_base = (char *) ch;
! 70: iov[0].iov_len = size;
! 71:
! 72: msg.msg_name = NULL;
! 73: msg.msg_namelen = 0;
! 74: msg.msg_iov = iov;
! 75: msg.msg_iovlen = 1;
! 76:
! 77: n = sendmsg(s, &msg, 0);
! 78:
! 79: if (n == -1) {
! 80: err = ngx_errno;
! 81: if (err == NGX_EAGAIN) {
! 82: return NGX_AGAIN;
! 83: }
! 84:
! 85: ngx_log_error(NGX_LOG_ALERT, log, err, "sendmsg() failed");
! 86: return NGX_ERROR;
! 87: }
! 88:
! 89: return NGX_OK;
! 90: }
! 91:
! 92:
! 93: ngx_int_t
! 94: ngx_read_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size, ngx_log_t *log)
! 95: {
! 96: ssize_t n;
! 97: ngx_err_t err;
! 98: struct iovec iov[1];
! 99: struct msghdr msg;
! 100:
! 101: #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
! 102: union {
! 103: struct cmsghdr cm;
! 104: char space[CMSG_SPACE(sizeof(int))];
! 105: } cmsg;
! 106: #else
! 107: int fd;
! 108: #endif
! 109:
! 110: iov[0].iov_base = (char *) ch;
! 111: iov[0].iov_len = size;
! 112:
! 113: msg.msg_name = NULL;
! 114: msg.msg_namelen = 0;
! 115: msg.msg_iov = iov;
! 116: msg.msg_iovlen = 1;
! 117:
! 118: #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
! 119: msg.msg_control = (caddr_t) &cmsg;
! 120: msg.msg_controllen = sizeof(cmsg);
! 121: #else
! 122: msg.msg_accrights = (caddr_t) &fd;
! 123: msg.msg_accrightslen = sizeof(int);
! 124: #endif
! 125:
! 126: n = recvmsg(s, &msg, 0);
! 127:
! 128: if (n == -1) {
! 129: err = ngx_errno;
! 130: if (err == NGX_EAGAIN) {
! 131: return NGX_AGAIN;
! 132: }
! 133:
! 134: ngx_log_error(NGX_LOG_ALERT, log, err, "recvmsg() failed");
! 135: return NGX_ERROR;
! 136: }
! 137:
! 138: if (n == 0) {
! 139: ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "recvmsg() returned zero");
! 140: return NGX_ERROR;
! 141: }
! 142:
! 143: if ((size_t) n < sizeof(ngx_channel_t)) {
! 144: ngx_log_error(NGX_LOG_ALERT, log, 0,
! 145: "recvmsg() returned not enough data: %uz", n);
! 146: return NGX_ERROR;
! 147: }
! 148:
! 149: #if (NGX_HAVE_MSGHDR_MSG_CONTROL)
! 150:
! 151: if (ch->command == NGX_CMD_OPEN_CHANNEL) {
! 152:
! 153: if (cmsg.cm.cmsg_len < (socklen_t) CMSG_LEN(sizeof(int))) {
! 154: ngx_log_error(NGX_LOG_ALERT, log, 0,
! 155: "recvmsg() returned too small ancillary data");
! 156: return NGX_ERROR;
! 157: }
! 158:
! 159: if (cmsg.cm.cmsg_level != SOL_SOCKET || cmsg.cm.cmsg_type != SCM_RIGHTS)
! 160: {
! 161: ngx_log_error(NGX_LOG_ALERT, log, 0,
! 162: "recvmsg() returned invalid ancillary data "
! 163: "level %d or type %d",
! 164: cmsg.cm.cmsg_level, cmsg.cm.cmsg_type);
! 165: return NGX_ERROR;
! 166: }
! 167:
! 168: /* ch->fd = *(int *) CMSG_DATA(&cmsg.cm); */
! 169:
! 170: ngx_memcpy(&ch->fd, CMSG_DATA(&cmsg.cm), sizeof(int));
! 171: }
! 172:
! 173: if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
! 174: ngx_log_error(NGX_LOG_ALERT, log, 0,
! 175: "recvmsg() truncated data");
! 176: }
! 177:
! 178: #else
! 179:
! 180: if (ch->command == NGX_CMD_OPEN_CHANNEL) {
! 181: if (msg.msg_accrightslen != sizeof(int)) {
! 182: ngx_log_error(NGX_LOG_ALERT, log, 0,
! 183: "recvmsg() returned no ancillary data");
! 184: return NGX_ERROR;
! 185: }
! 186:
! 187: ch->fd = fd;
! 188: }
! 189:
! 190: #endif
! 191:
! 192: return n;
! 193: }
! 194:
! 195:
! 196: ngx_int_t
! 197: ngx_add_channel_event(ngx_cycle_t *cycle, ngx_fd_t fd, ngx_int_t event,
! 198: ngx_event_handler_pt handler)
! 199: {
! 200: ngx_event_t *ev, *rev, *wev;
! 201: ngx_connection_t *c;
! 202:
! 203: c = ngx_get_connection(fd, cycle->log);
! 204:
! 205: if (c == NULL) {
! 206: return NGX_ERROR;
! 207: }
! 208:
! 209: c->pool = cycle->pool;
! 210:
! 211: rev = c->read;
! 212: wev = c->write;
! 213:
! 214: rev->log = cycle->log;
! 215: wev->log = cycle->log;
! 216:
! 217: #if (NGX_THREADS)
! 218: rev->lock = &c->lock;
! 219: wev->lock = &c->lock;
! 220: rev->own_lock = &c->lock;
! 221: wev->own_lock = &c->lock;
! 222: #endif
! 223:
! 224: rev->channel = 1;
! 225: wev->channel = 1;
! 226:
! 227: ev = (event == NGX_READ_EVENT) ? rev : wev;
! 228:
! 229: ev->handler = handler;
! 230:
! 231: if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
! 232: if (ngx_add_conn(c) == NGX_ERROR) {
! 233: ngx_free_connection(c);
! 234: return NGX_ERROR;
! 235: }
! 236:
! 237: } else {
! 238: if (ngx_add_event(ev, event, 0) == NGX_ERROR) {
! 239: ngx_free_connection(c);
! 240: return NGX_ERROR;
! 241: }
! 242: }
! 243:
! 244: return NGX_OK;
! 245: }
! 246:
! 247:
! 248: void
! 249: ngx_close_channel(ngx_fd_t *fd, ngx_log_t *log)
! 250: {
! 251: if (close(fd[0]) == -1) {
! 252: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
! 253: }
! 254:
! 255: if (close(fd[1]) == -1) {
! 256: ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "close() channel failed");
! 257: }
! 258: }
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