diff options
Diffstat (limited to 'src/anet.c')
| -rw-r--r-- | src/anet.c | 706 |
1 files changed, 706 insertions, 0 deletions
diff --git a/src/anet.c b/src/anet.c new file mode 100644 index 0000000..64824a2 --- /dev/null +++ b/src/anet.c @@ -0,0 +1,706 @@ +/* anet.c -- Basic TCP socket stuff made a bit less boring + * + * Copyright (c) 2006-2012, Salvatore Sanfilippo <antirez at gmail dot com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Redis nor the names of its contributors may be used + * to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include "fmacros.h" + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/un.h> +#include <sys/time.h> +#include <netinet/in.h> +#include <netinet/tcp.h> +#include <arpa/inet.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <netdb.h> +#include <errno.h> +#include <stdarg.h> +#include <stdio.h> + +#include "anet.h" +#include "config.h" +#include "util.h" + +#define UNUSED(x) (void)(x) + +static void anetSetError(char *err, const char *fmt, ...) +{ + va_list ap; + + if (!err) return; + va_start(ap, fmt); + vsnprintf(err, ANET_ERR_LEN, fmt, ap); + va_end(ap); +} + +int anetGetError(int fd) { + int sockerr = 0; + socklen_t errlen = sizeof(sockerr); + + if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &sockerr, &errlen) == -1) + sockerr = errno; + return sockerr; +} + +int anetSetBlock(char *err, int fd, int non_block) { + int flags; + + /* Set the socket blocking (if non_block is zero) or non-blocking. + * Note that fcntl(2) for F_GETFL and F_SETFL can't be + * interrupted by a signal. */ + if ((flags = fcntl(fd, F_GETFL)) == -1) { + anetSetError(err, "fcntl(F_GETFL): %s", strerror(errno)); + return ANET_ERR; + } + + /* Check if this flag has been set or unset, if so, + * then there is no need to call fcntl to set/unset it again. */ + if (!!(flags & O_NONBLOCK) == !!non_block) + return ANET_OK; + + if (non_block) + flags |= O_NONBLOCK; + else + flags &= ~O_NONBLOCK; + + if (fcntl(fd, F_SETFL, flags) == -1) { + anetSetError(err, "fcntl(F_SETFL,O_NONBLOCK): %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +} + +int anetNonBlock(char *err, int fd) { + return anetSetBlock(err,fd,1); +} + +int anetBlock(char *err, int fd) { + return anetSetBlock(err,fd,0); +} + +/* Enable the FD_CLOEXEC on the given fd to avoid fd leaks. + * This function should be invoked for fd's on specific places + * where fork + execve system calls are called. */ +int anetCloexec(int fd) { + int r; + int flags; + + do { + r = fcntl(fd, F_GETFD); + } while (r == -1 && errno == EINTR); + + if (r == -1 || (r & FD_CLOEXEC)) + return r; + + flags = r | FD_CLOEXEC; + + do { + r = fcntl(fd, F_SETFD, flags); + } while (r == -1 && errno == EINTR); + + return r; +} + +/* Set TCP keep alive option to detect dead peers. The interval option + * is only used for Linux as we are using Linux-specific APIs to set + * the probe send time, interval, and count. */ +int anetKeepAlive(char *err, int fd, int interval) +{ + int val = 1; + + if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) == -1) + { + anetSetError(err, "setsockopt SO_KEEPALIVE: %s", strerror(errno)); + return ANET_ERR; + } + +#ifdef __linux__ + /* Default settings are more or less garbage, with the keepalive time + * set to 7200 by default on Linux. Modify settings to make the feature + * actually useful. */ + + /* Send first probe after interval. */ + val = interval; + if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof(val)) < 0) { + anetSetError(err, "setsockopt TCP_KEEPIDLE: %s\n", strerror(errno)); + return ANET_ERR; + } + + /* Send next probes after the specified interval. Note that we set the + * delay as interval / 3, as we send three probes before detecting + * an error (see the next setsockopt call). */ + val = interval/3; + if (val == 0) val = 1; + if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof(val)) < 0) { + anetSetError(err, "setsockopt TCP_KEEPINTVL: %s\n", strerror(errno)); + return ANET_ERR; + } + + /* Consider the socket in error state after three we send three ACK + * probes without getting a reply. */ + val = 3; + if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof(val)) < 0) { + anetSetError(err, "setsockopt TCP_KEEPCNT: %s\n", strerror(errno)); + return ANET_ERR; + } +#elif defined(__APPLE__) + /* Set idle time with interval */ + val = interval; + if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0) { + anetSetError(err, "setsockopt TCP_KEEPALIVE: %s\n", strerror(errno)); + return ANET_ERR; + } +#else + ((void) interval); /* Avoid unused var warning for non Linux systems. */ +#endif + + return ANET_OK; +} + +static int anetSetTcpNoDelay(char *err, int fd, int val) +{ + if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) == -1) + { + anetSetError(err, "setsockopt TCP_NODELAY: %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +} + +int anetEnableTcpNoDelay(char *err, int fd) +{ + return anetSetTcpNoDelay(err, fd, 1); +} + +int anetDisableTcpNoDelay(char *err, int fd) +{ + return anetSetTcpNoDelay(err, fd, 0); +} + +/* Set the socket send timeout (SO_SNDTIMEO socket option) to the specified + * number of milliseconds, or disable it if the 'ms' argument is zero. */ +int anetSendTimeout(char *err, int fd, long long ms) { + struct timeval tv; + + tv.tv_sec = ms/1000; + tv.tv_usec = (ms%1000)*1000; + if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) == -1) { + anetSetError(err, "setsockopt SO_SNDTIMEO: %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +} + +/* Set the socket receive timeout (SO_RCVTIMEO socket option) to the specified + * number of milliseconds, or disable it if the 'ms' argument is zero. */ +int anetRecvTimeout(char *err, int fd, long long ms) { + struct timeval tv; + + tv.tv_sec = ms/1000; + tv.tv_usec = (ms%1000)*1000; + if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1) { + anetSetError(err, "setsockopt SO_RCVTIMEO: %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +} + +/* Resolve the hostname "host" and set the string representation of the + * IP address into the buffer pointed by "ipbuf". + * + * If flags is set to ANET_IP_ONLY the function only resolves hostnames + * that are actually already IPv4 or IPv6 addresses. This turns the function + * into a validating / normalizing function. */ +int anetResolve(char *err, char *host, char *ipbuf, size_t ipbuf_len, + int flags) +{ + struct addrinfo hints, *info; + int rv; + + memset(&hints,0,sizeof(hints)); + if (flags & ANET_IP_ONLY) hints.ai_flags = AI_NUMERICHOST; + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; /* specify socktype to avoid dups */ + + if ((rv = getaddrinfo(host, NULL, &hints, &info)) != 0) { + anetSetError(err, "%s", gai_strerror(rv)); + return ANET_ERR; + } + if (info->ai_family == AF_INET) { + struct sockaddr_in *sa = (struct sockaddr_in *)info->ai_addr; + inet_ntop(AF_INET, &(sa->sin_addr), ipbuf, ipbuf_len); + } else { + struct sockaddr_in6 *sa = (struct sockaddr_in6 *)info->ai_addr; + inet_ntop(AF_INET6, &(sa->sin6_addr), ipbuf, ipbuf_len); + } + + freeaddrinfo(info); + return ANET_OK; +} + +static int anetSetReuseAddr(char *err, int fd) { + int yes = 1; + /* Make sure connection-intensive things like the redis benchmark + * will be able to close/open sockets a zillion of times */ + if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) { + anetSetError(err, "setsockopt SO_REUSEADDR: %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +} + +static int anetCreateSocket(char *err, int domain) { + int s; + if ((s = socket(domain, SOCK_STREAM, 0)) == -1) { + anetSetError(err, "creating socket: %s", strerror(errno)); + return ANET_ERR; + } + + /* Make sure connection-intensive things like the redis benchmark + * will be able to close/open sockets a zillion of times */ + if (anetSetReuseAddr(err,s) == ANET_ERR) { + close(s); + return ANET_ERR; + } + return s; +} + +#define ANET_CONNECT_NONE 0 +#define ANET_CONNECT_NONBLOCK 1 +#define ANET_CONNECT_BE_BINDING 2 /* Best effort binding. */ +static int anetTcpGenericConnect(char *err, const char *addr, int port, + const char *source_addr, int flags) +{ + int s = ANET_ERR, rv; + char portstr[6]; /* strlen("65535") + 1; */ + struct addrinfo hints, *servinfo, *bservinfo, *p, *b; + + snprintf(portstr,sizeof(portstr),"%d",port); + memset(&hints,0,sizeof(hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + + if ((rv = getaddrinfo(addr,portstr,&hints,&servinfo)) != 0) { + anetSetError(err, "%s", gai_strerror(rv)); + return ANET_ERR; + } + for (p = servinfo; p != NULL; p = p->ai_next) { + /* Try to create the socket and to connect it. + * If we fail in the socket() call, or on connect(), we retry with + * the next entry in servinfo. */ + if ((s = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == -1) + continue; + if (anetSetReuseAddr(err,s) == ANET_ERR) goto error; + if (flags & ANET_CONNECT_NONBLOCK && anetNonBlock(err,s) != ANET_OK) + goto error; + if (source_addr) { + int bound = 0; + /* Using getaddrinfo saves us from self-determining IPv4 vs IPv6 */ + if ((rv = getaddrinfo(source_addr, NULL, &hints, &bservinfo)) != 0) + { + anetSetError(err, "%s", gai_strerror(rv)); + goto error; + } + for (b = bservinfo; b != NULL; b = b->ai_next) { + if (bind(s,b->ai_addr,b->ai_addrlen) != -1) { + bound = 1; + break; + } + } + freeaddrinfo(bservinfo); + if (!bound) { + anetSetError(err, "bind: %s", strerror(errno)); + goto error; + } + } + if (connect(s,p->ai_addr,p->ai_addrlen) == -1) { + /* If the socket is non-blocking, it is ok for connect() to + * return an EINPROGRESS error here. */ + if (errno == EINPROGRESS && flags & ANET_CONNECT_NONBLOCK) + goto end; + close(s); + s = ANET_ERR; + continue; + } + + /* If we ended an iteration of the for loop without errors, we + * have a connected socket. Let's return to the caller. */ + goto end; + } + if (p == NULL) + anetSetError(err, "creating socket: %s", strerror(errno)); + +error: + if (s != ANET_ERR) { + close(s); + s = ANET_ERR; + } + +end: + freeaddrinfo(servinfo); + + /* Handle best effort binding: if a binding address was used, but it is + * not possible to create a socket, try again without a binding address. */ + if (s == ANET_ERR && source_addr && (flags & ANET_CONNECT_BE_BINDING)) { + return anetTcpGenericConnect(err,addr,port,NULL,flags); + } else { + return s; + } +} + +int anetTcpNonBlockConnect(char *err, const char *addr, int port) +{ + return anetTcpGenericConnect(err,addr,port,NULL,ANET_CONNECT_NONBLOCK); +} + +int anetTcpNonBlockBestEffortBindConnect(char *err, const char *addr, int port, + const char *source_addr) +{ + return anetTcpGenericConnect(err,addr,port,source_addr, + ANET_CONNECT_NONBLOCK|ANET_CONNECT_BE_BINDING); +} + +int anetUnixGenericConnect(char *err, const char *path, int flags) +{ + int s; + struct sockaddr_un sa; + + if ((s = anetCreateSocket(err,AF_LOCAL)) == ANET_ERR) + return ANET_ERR; + + sa.sun_family = AF_LOCAL; + redis_strlcpy(sa.sun_path,path,sizeof(sa.sun_path)); + if (flags & ANET_CONNECT_NONBLOCK) { + if (anetNonBlock(err,s) != ANET_OK) { + close(s); + return ANET_ERR; + } + } + if (connect(s,(struct sockaddr*)&sa,sizeof(sa)) == -1) { + if (errno == EINPROGRESS && + flags & ANET_CONNECT_NONBLOCK) + return s; + + anetSetError(err, "connect: %s", strerror(errno)); + close(s); + return ANET_ERR; + } + return s; +} + +static int anetListen(char *err, int s, struct sockaddr *sa, socklen_t len, int backlog, mode_t perm) { + if (bind(s,sa,len) == -1) { + anetSetError(err, "bind: %s", strerror(errno)); + close(s); + return ANET_ERR; + } + + if (sa->sa_family == AF_LOCAL && perm) + chmod(((struct sockaddr_un *) sa)->sun_path, perm); + + if (listen(s, backlog) == -1) { + anetSetError(err, "listen: %s", strerror(errno)); + close(s); + return ANET_ERR; + } + return ANET_OK; +} + +static int anetV6Only(char *err, int s) { + int yes = 1; + if (setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,&yes,sizeof(yes)) == -1) { + anetSetError(err, "setsockopt: %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +} + +static int _anetTcpServer(char *err, int port, char *bindaddr, int af, int backlog) +{ + int s = -1, rv; + char _port[6]; /* strlen("65535") */ + struct addrinfo hints, *servinfo, *p; + + snprintf(_port,6,"%d",port); + memset(&hints,0,sizeof(hints)); + hints.ai_family = af; + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = AI_PASSIVE; /* No effect if bindaddr != NULL */ + if (bindaddr && !strcmp("*", bindaddr)) + bindaddr = NULL; + if (af == AF_INET6 && bindaddr && !strcmp("::*", bindaddr)) + bindaddr = NULL; + + if ((rv = getaddrinfo(bindaddr,_port,&hints,&servinfo)) != 0) { + anetSetError(err, "%s", gai_strerror(rv)); + return ANET_ERR; + } + for (p = servinfo; p != NULL; p = p->ai_next) { + if ((s = socket(p->ai_family,p->ai_socktype,p->ai_protocol)) == -1) + continue; + + if (af == AF_INET6 && anetV6Only(err,s) == ANET_ERR) goto error; + if (anetSetReuseAddr(err,s) == ANET_ERR) goto error; + if (anetListen(err,s,p->ai_addr,p->ai_addrlen,backlog,0) == ANET_ERR) s = ANET_ERR; + goto end; + } + if (p == NULL) { + anetSetError(err, "unable to bind socket, errno: %d", errno); + goto error; + } + +error: + if (s != -1) close(s); + s = ANET_ERR; +end: + freeaddrinfo(servinfo); + return s; +} + +int anetTcpServer(char *err, int port, char *bindaddr, int backlog) +{ + return _anetTcpServer(err, port, bindaddr, AF_INET, backlog); +} + +int anetTcp6Server(char *err, int port, char *bindaddr, int backlog) +{ + return _anetTcpServer(err, port, bindaddr, AF_INET6, backlog); +} + +int anetUnixServer(char *err, char *path, mode_t perm, int backlog) +{ + int s; + struct sockaddr_un sa; + + if (strlen(path) > sizeof(sa.sun_path)-1) { + anetSetError(err,"unix socket path too long (%zu), must be under %zu", strlen(path), sizeof(sa.sun_path)); + return ANET_ERR; + } + if ((s = anetCreateSocket(err,AF_LOCAL)) == ANET_ERR) + return ANET_ERR; + + memset(&sa,0,sizeof(sa)); + sa.sun_family = AF_LOCAL; + redis_strlcpy(sa.sun_path,path,sizeof(sa.sun_path)); + if (anetListen(err,s,(struct sockaddr*)&sa,sizeof(sa),backlog,perm) == ANET_ERR) + return ANET_ERR; + return s; +} + +/* Accept a connection and also make sure the socket is non-blocking, and CLOEXEC. + * returns the new socket FD, or -1 on error. */ +static int anetGenericAccept(char *err, int s, struct sockaddr *sa, socklen_t *len) { + int fd; + do { + /* Use the accept4() call on linux to simultaneously accept and + * set a socket as non-blocking. */ +#ifdef HAVE_ACCEPT4 + fd = accept4(s, sa, len, SOCK_NONBLOCK | SOCK_CLOEXEC); +#else + fd = accept(s,sa,len); +#endif + } while(fd == -1 && errno == EINTR); + if (fd == -1) { + anetSetError(err, "accept: %s", strerror(errno)); + return ANET_ERR; + } +#ifndef HAVE_ACCEPT4 + if (anetCloexec(fd) == -1) { + anetSetError(err, "anetCloexec: %s", strerror(errno)); + close(fd); + return ANET_ERR; + } + if (anetNonBlock(err, fd) != ANET_OK) { + close(fd); + return ANET_ERR; + } +#endif + return fd; +} + +/* Accept a connection and also make sure the socket is non-blocking, and CLOEXEC. + * returns the new socket FD, or -1 on error. */ +int anetTcpAccept(char *err, int serversock, char *ip, size_t ip_len, int *port) { + int fd; + struct sockaddr_storage sa; + socklen_t salen = sizeof(sa); + if ((fd = anetGenericAccept(err,serversock,(struct sockaddr*)&sa,&salen)) == ANET_ERR) + return ANET_ERR; + + if (sa.ss_family == AF_INET) { + struct sockaddr_in *s = (struct sockaddr_in *)&sa; + if (ip) inet_ntop(AF_INET,(void*)&(s->sin_addr),ip,ip_len); + if (port) *port = ntohs(s->sin_port); + } else { + struct sockaddr_in6 *s = (struct sockaddr_in6 *)&sa; + if (ip) inet_ntop(AF_INET6,(void*)&(s->sin6_addr),ip,ip_len); + if (port) *port = ntohs(s->sin6_port); + } + return fd; +} + +/* Accept a connection and also make sure the socket is non-blocking, and CLOEXEC. + * returns the new socket FD, or -1 on error. */ +int anetUnixAccept(char *err, int s) { + int fd; + struct sockaddr_un sa; + socklen_t salen = sizeof(sa); + if ((fd = anetGenericAccept(err,s,(struct sockaddr*)&sa,&salen)) == ANET_ERR) + return ANET_ERR; + + return fd; +} + +int anetFdToString(int fd, char *ip, size_t ip_len, int *port, int remote) { + struct sockaddr_storage sa; + socklen_t salen = sizeof(sa); + + if (remote) { + if (getpeername(fd, (struct sockaddr *)&sa, &salen) == -1) goto error; + } else { + if (getsockname(fd, (struct sockaddr *)&sa, &salen) == -1) goto error; + } + + if (sa.ss_family == AF_INET) { + struct sockaddr_in *s = (struct sockaddr_in *)&sa; + if (ip) { + if (inet_ntop(AF_INET,(void*)&(s->sin_addr),ip,ip_len) == NULL) + goto error; + } + if (port) *port = ntohs(s->sin_port); + } else if (sa.ss_family == AF_INET6) { + struct sockaddr_in6 *s = (struct sockaddr_in6 *)&sa; + if (ip) { + if (inet_ntop(AF_INET6,(void*)&(s->sin6_addr),ip,ip_len) == NULL) + goto error; + } + if (port) *port = ntohs(s->sin6_port); + } else if (sa.ss_family == AF_UNIX) { + if (ip) { + int res = snprintf(ip, ip_len, "/unixsocket"); + if (res < 0 || (unsigned int) res >= ip_len) goto error; + } + if (port) *port = 0; + } else { + goto error; + } + return 0; + +error: + if (ip) { + if (ip_len >= 2) { + ip[0] = '?'; + ip[1] = '\0'; + } else if (ip_len == 1) { + ip[0] = '\0'; + } + } + if (port) *port = 0; + return -1; +} + +/* Create a pipe buffer with given flags for read end and write end. + * Note that it supports the file flags defined by pipe2() and fcntl(F_SETFL), + * and one of the use cases is O_CLOEXEC|O_NONBLOCK. */ +int anetPipe(int fds[2], int read_flags, int write_flags) { + int pipe_flags = 0; +#if defined(__linux__) || defined(__FreeBSD__) + /* When possible, try to leverage pipe2() to apply flags that are common to both ends. + * There is no harm to set O_CLOEXEC to prevent fd leaks. */ + pipe_flags = O_CLOEXEC | (read_flags & write_flags); + if (pipe2(fds, pipe_flags)) { + /* Fail on real failures, and fallback to simple pipe if pipe2 is unsupported. */ + if (errno != ENOSYS && errno != EINVAL) + return -1; + pipe_flags = 0; + } else { + /* If the flags on both ends are identical, no need to do anything else. */ + if ((O_CLOEXEC | read_flags) == (O_CLOEXEC | write_flags)) + return 0; + /* Clear the flags which have already been set using pipe2. */ + read_flags &= ~pipe_flags; + write_flags &= ~pipe_flags; + } +#endif + + /* When we reach here with pipe_flags of 0, it means pipe2 failed (or was not attempted), + * so we try to use pipe. Otherwise, we skip and proceed to set specific flags below. */ + if (pipe_flags == 0 && pipe(fds)) + return -1; + + /* File descriptor flags. + * Currently, only one such flag is defined: FD_CLOEXEC, the close-on-exec flag. */ + if (read_flags & O_CLOEXEC) + if (fcntl(fds[0], F_SETFD, FD_CLOEXEC)) + goto error; + if (write_flags & O_CLOEXEC) + if (fcntl(fds[1], F_SETFD, FD_CLOEXEC)) + goto error; + + /* File status flags after clearing the file descriptor flag O_CLOEXEC. */ + read_flags &= ~O_CLOEXEC; + if (read_flags) + if (fcntl(fds[0], F_SETFL, read_flags)) + goto error; + write_flags &= ~O_CLOEXEC; + if (write_flags) + if (fcntl(fds[1], F_SETFL, write_flags)) + goto error; + + return 0; + +error: + close(fds[0]); + close(fds[1]); + return -1; +} + +int anetSetSockMarkId(char *err, int fd, uint32_t id) { +#ifdef HAVE_SOCKOPTMARKID + if (setsockopt(fd, SOL_SOCKET, SOCKOPTMARKID, (void *)&id, sizeof(id)) == -1) { + anetSetError(err, "setsockopt: %s", strerror(errno)); + return ANET_ERR; + } + return ANET_OK; +#else + UNUSED(fd); + UNUSED(id); + anetSetError(err,"anetSetSockMarkid unsupported on this platform"); + return ANET_OK; +#endif +} + +int anetIsFifo(char *filepath) { + struct stat sb; + if (stat(filepath, &sb) == -1) return 0; + return S_ISFIFO(sb.st_mode); +} |