Unison Help
![](https://rowebots.com/wp-content/plugins/documentor/skins/default/images/search.png)
- Unison Kernel
- Pthreads
- pthread_create()
- pthread_exit()
- pthread_self()
- pthread_equal()
- pthread_join()
- pthread_detach()
- pthread_setschedparam()
- pthread_getschedparam()
- pthread_attr_init()
- pthread_attr_destroy()
- pthread_attr_setstackaddr()
- pthread_attr_getstackaddr()
- pthread_attr_setstacksize()
- pthread_attr_getstacksize()
- pthread_attr_setschedparam()
- pthread_attr_getschedparam()
- pthread_attr_setdetachstate()
- pthread_attr_getdetachstate()
- pthread_stackinfo()
- pthread_setprio()
- pthread_getprio()
- sched_get_priority_max()
- sched_get_priority_min()
- sched_yield()
- Pthread Cancellation
- Mutex
- Semaphores
- Message Queues
- Conditional Variables
- Barriers
- Timers
- Clocks
- Memory Allocation
- Rendezvous
- Interrupts
- Directory Services
- Miscellaneous
- Pthreads
- Unison I/O Library
- Unison STDIO Library
- STDIO Library Calls
- clearerr()
- dprintf()
- fclose()
- fdopen()
- feof()
- ferror()
- fileno()
- fflush()
- fgetc()
- fgetpos()
- fgets()
- fopen()
- fprintf()
- fputc()
- fputs()
- fread()
- freopen()
- fscanf()
- fseek()
- fseeko()
- fsetpos()
- ftell()
- ftello()
- fwrite()
- getc()
- getc_unlocked()
- getchar()
- getchar_unlocked()
- getdelim()
- getline()
- gets()
- get_stderr_ptr()
- get_stdin_ptr()
- get_stdout_ptr()
- noperprintf()
- perprintf()
- perror()
- posix_compat()
- printf()
- putc()
- putc_unlocked()
- putchar()
- putchar_unlocked()
- puts()
- remove()
- rewind()
- scanf()
- setbuf()
- setvbuf()
- snprintf()
- sprintf()
- sscanf()
- stderr_init()
- stderr_close()
- stdin_init()
- stdin_close()
- stdout_init()
- stdout_close()
- vdprintf()
- vscanf()
- vsscanf()
- vfscanf()
- vprintf()
- vsnprintf()
- vsprintf()
- vfprintf()
- ungetc()
- Do-nothing Stubs
- STDIO Library Calls
- Unison LIBC Library
- Unison I/O Servers
- Graphics, Camera, Video, Audio
- Network Protocols
- TCP and UDP Server - tcpd
- DHCP Client Service - dhcp client
- DHCP Server - dhcpd
- Telnet Server - telnetd
- Tiny FTP Server - tftpd
- Point to Point - pppd
- Network Translation - NAT with PAT
- Firewall
- Tiny HTTP Server - thttpd
- Tiny HTTP Server with TLS
- POP3 Server
- Simple Mail Transfer Protocol Services (SMTP)
- Bootp Protocol
- File Transfer Protocol Server (FTP)
- File Transfer Client Services
- RPC / XDR
- DNS Client
- HTTP/HTTPS Client
- REST Client
- AutoIP Service - autoip client
- mDNS server - mdnsd
- SNTP Client
- SNMP Agent - Snmpd server
- SSL/TLS library
- SSH server
- IP security
- Power Control
- Serial I/O
- System Services
- Universal Serial Bus (USB)
- Wireless
- Remedy Tools for Unison
2.13.listen() #
NAME
listen – listen for connections on a socket
SYNOPSIS
#include <sys/socket.h>
- int listen(int s , int backlog );
DESCRIPTION
To accept connections, a socket is first created with socket(), a backlog for incoming connections is specified with listen() and then the connections are accepted with accept(). The listen() call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET.
The backlog parameter defines the maximum length the queue of pending connections may grow to. If a connection request arrives with the queue full, the client will receive an error with an indication of ECONNREFUSED.
RETURN VALUES
A 0 return value indicates success; -1 indicates an error.
ERRORS
This function is a member of Unison’s IOLIB family of functions. IOLIB is implemented as a message passing and generalized interface layer. Each Unison I/O server is responsible for its own error reporting.
For an exact list of error codes returned by a particular server, refer to that server’s documentation in the Unison Programmer’s Guide for each specific platform.
Servers may implement these errors codes in response to this function.
The call fails if:
- EBADF
- The argument s is not a valid file descriptor.
- ENOTSOCK
- The argument s is not a socket.
- EOPNOTSUPP
- The socket is not of a type that supports the operation listen().
SEE ALSO
NOTES
There is currently no backlog limit.