projects / unix-history / blame
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1 | .\" Copyright (c) 1983 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 19914c9b | 5 | .\" @(#)connect.2 6.3 (Berkeley) %G% |
| 5b41da86 | 6 | .\" |
| bf25b211 | 7 | .TH CONNECT 2 "" |
| 5b41da86 KM |
8 | .UC 5 |
| 9 | .SH NAME | |
| 10 | connect \- initiate a connection on a socket | |
| 11 | .SH SYNOPSIS | |
| 12 | .nf | |
| 13 | .ft B | |
| 14 | #include <sys/types.h> | |
| 15 | #include <sys/socket.h> | |
| 16 | .PP | |
| 17 | .ft B | |
| 18 | connect(s, name, namelen) | |
| 19 | int s; | |
| 20 | struct sockaddr *name; | |
| 21 | int namelen; | |
| 22 | .fi | |
| 23 | .SH DESCRIPTION | |
| 24 | The parameter | |
| 25 | .I s | |
| 26 | is a socket. | |
| 27 | If it is of type SOCK_DGRAM, | |
| 28 | then this call permanently specifies the peer to which | |
| 29 | datagrams are to be sent; | |
| 30 | if it is of type SOCK_STREAM, | |
| 31 | then this call attempts to make a connection to | |
| 32 | another socket. | |
| 33 | The other socket is specified by | |
| 19914c9b | 34 | .I name, |
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35 | which is an address in the communications space of the socket. |
| 36 | Each communications space interprets the | |
| 37 | .I name | |
| 38 | parameter in its own way. | |
| 39 | .SH "RETURN VALUE | |
| 40 | If the connection or binding succeeds, then 0 is returned. | |
| 41 | Otherwise a \-1 is returned, and a more specific error | |
| 42 | code is stored in \fIerrno\fP. | |
| 43 | .SH "ERRORS | |
| 44 | The call fails if: | |
| 45 | .TP 20 | |
| 46 | [EBADF] | |
| 47 | .I S | |
| 48 | is not a valid descriptor. | |
| 49 | .TP 20 | |
| 50 | [ENOTSOCK] | |
| 51 | .I S | |
| 52 | is a descriptor for a file, not a socket. | |
| 53 | .TP 20 | |
| 54 | [EADDRNOTAVAIL] | |
| 55 | The specified address is not available on this machine. | |
| 56 | .TP 20 | |
| 57 | [EAFNOSUPPORT] | |
| 58 | Addresses in the specified address family cannot be used with this socket. | |
| 59 | .TP 20 | |
| 60 | [EISCONN] | |
| 61 | The socket is already connected. | |
| 62 | .TP 20 | |
| 63 | [ETIMEDOUT] | |
| 64 | Connection establishment timed out without establishing a connection. | |
| 65 | .TP 20 | |
| 66 | [ECONNREFUSED] | |
| 67 | The attempt to connect was forcefully rejected. | |
| 68 | .TP 20 | |
| 69 | [ENETUNREACH] | |
| 70 | The network isn't reachable from this host. | |
| 71 | .TP 20 | |
| 72 | [EADDRINUSE] | |
| 73 | The address is already in use. | |
| 74 | .TP 20 | |
| 75 | [EFAULT] | |
| 76 | The \fIname\fP parameter specifies an area outside | |
| 77 | the process address space. | |
| 78 | .TP 20 | |
| 79 | [EWOULDBLOCK] | |
| 80 | The socket is non-blocking and the | |
| 81 | and the connection cannot | |
| 82 | be completed immediately. | |
| 83 | It is possible to | |
| 84 | .IR select (2) | |
| 85 | the socket while it is connecting by selecting it for writing. | |
| b5984ffe KM |
86 | .PP |
| 87 | .PP | |
| 88 | The following errors are specific to connecting names in the UNIX domain. | |
| 89 | These errors may not apply in future versions of the UNIX ipc domain. | |
| 90 | .TP 15 | |
| 91 | [ENOTDIR] | |
| 92 | A component of the path prefix is not a directory. | |
| 93 | .TP 15 | |
| 94 | [EINVAL] | |
| 95 | The pathname contains a character with the high-order bit set. | |
| 96 | .TP 15 | |
| 97 | [ENAMETOOLONG] | |
| 98 | A component of a pathname exceeded 255 characters, | |
| 99 | or an entire path name exceeded 1023 characters. | |
| 100 | .TP 15 | |
| 101 | [ENOENT] | |
| 102 | The named socket does not exist. | |
| 103 | .TP 15 | |
| 104 | [EACCES] | |
| 105 | Search permission is denied for a component of the path prefix. | |
| 106 | .TP 15 | |
| 107 | [ELOOP] | |
| 108 | Too many symbolic links were encountered in translating the pathname. | |
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109 | .SH SEE ALSO |
| 110 | accept(2), select(2), socket(2), getsockname(2) |