Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

System Functions (a - d) accept(2)
If the queue of pending connections is empty of connection requests and the socket’s file
descriptor is blocking (O_NONBLOCK is not set), the accept() function blocks until a connec-
tion is present. If the socket’s file descriptor is marked nonblocking (O_NONBLOCK is set) and
the queue of pending connections is empty, the accept() function call fails and sets errno to
[EWOULDBLOCK].
NOTES
This function requires that the feature-test macro _XOPEN_SOURCE_EXTENDED be specified
when you compile the module.
When a connection is available, a call to the select() function indicates that the file descriptor for
the original socket is ready for reading.
The accepted socket cannot itself accept more connections. The original socket remains open
and can accept more connections.
To use the accept() functionality in a threaded application that uses the Standard POSIX Threads
library, see spt_acceptx(2).
To use this function in a threaded application that uses the POSIX User Thread Model library on
systems running J06.10 or later RVUs or H06.21 or later RVUs, you must perform all of the fol-
lowing tasks to make the function thread-aware in a multi-threaded application:
• Compile the application using the _PUT_MODEL_ feature test macro or equivalent
compiler command option.
• Link the application to the zputdll library (/G/system/zdllnnn/zputdll).
On systems running H06.24 or later H-series RVUs or J06.13 or later J-series RVUs, you can use
this function with 32-bit or 64-bit OSS applications.
To use this function in a 32-bit threaded application that uses the POSIX User Thread Model
library on systems running H06.24 or later RVUs or J06.13 or later RVUs, perform the same
tasks (described above) used to enable the function on systems running H06.21/J06.10 or later
RVUs.
To use this function in a 64-bit threaded application that uses the POSIX User Thread Model
library on systems running H06.24 or later RVUs or J06.13 or later RVUs, you must perform all
of the following tasks:
• Compile the application using the _PUT_MODEL_ feature test macro or equivalent
compiler command option.
• Compile the application using the -Wlp64 compiler command option.
• Link the application to the yputdll library (/G/system/zdllnnn/yputdll).
For detailed information about writing multi-threaded and 64-bit applications for the Open Sys-
tem Services environment, see the Open System Services Programmer’s Guide.
RETURN VALUES
Upon successful completion, the accept() function returns the file descriptor of the accepted
socket. If the accept() function call fails, the value -1 is returned and errno is set to indicate the
error.
ERRORS
If any of the following conditions occurs, the accept() function sets errno to the corresponding
value:
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