poll_solaris.c revision 34f9b3eef6fdadbda0a846aa4d68691ac40eace5
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1982-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Roland Mainz <roland.mainz@nrubsig.org> *
* *
***********************************************************************/
#pragma prototyped
#include <shell.h>
#include <stdio.h>
#include <stdbool.h>
#include <option.h>
#include <stk.h>
#include <tm.h>
#include "name.h"
#ifndef SH_DICT
# define SH_DICT "libshell"
#endif
#include <poll.h>
#ifdef __GNUC__
#include <alloca.h>
#endif /* __GNUC__ */
static const char sh_optpoll[] =
"[-?\n@(#)$Id: poll (AT&T Labs Research) 2009-05-14 $\n]"
"[-author?Roland Mainz <roland.mainz@nrubsig.org]"
"[-license?http://www.opensource.org/licenses/cpl1.0.txt]"
"[+DESCRIPTION?The poll command provides applications with a mechanism "
"For each member of the array variable \bvar\b, "
"poll examines the given file descriptor in the subscript \b.fd\b "
"for the event(s) specified in the subscript \b.events\b."
"The poll command identifies those file descriptors on which an "
"application can read or write data, or on which certain events have "
"occurred.]"
"[+?The \bvar\b argument specifies the file descriptors to be examined "
"and the events of interest for each file descriptor. "
"It is a array of structured variables with one member for each open "
"file descriptor of interest. The array's members contain the following "
"subscripts:]{"
"[+?\b.fd\b # file descriptor]"
"[+?\b.events\b # requested events]"
"[+?\b.revents\b # returned event]"
"}"
"[+?The \bfd\b variable specifies an open file descriptor and the "
"\bevents\b and \brevents\b members are strings constructed from "
"a concaternation of the following event flags, seperated by '|':]"
"{ "
"[+POLLIN?Data other than high priority data may be "
"read without blocking. For STREAMS, this "
"flag is set in revents even if the message "
"is of zero length.]"
"[+POLLRDNORM?Normal data (priority band equals 0) may be "
"read without blocking. For STREAMS, this "
"flag is set in revents even if the message "
"is of zero length.]"
"[+POLLRDBAND?Data from a non-zero priority band may be "
"read without blocking. For STREAMS, this "
"flag is set in revents even if the message "
"is of zero length.]"
"[+POLLPRI?High priority data may be received without "
"blocking. For STREAMS, this flag is set in "
"revents even if the message is of zero "
"length.]"
"[+POLLOUT?Normal data (priority band equals 0) may be "
"written without blocking.]"
"[+POLLWRNORM?The same as POLLOUT.]"
"[+POLLWRBAND?Priority data (priority band > 0) may be "
"written. This event only examines bands "
"that have been written to at least once.]"
"[+POLLERR?An error has occurred on the device or "
"stream. This flag is only valid in the "
"revents bitmask; it is not used in the "
"events member.]"
"[+POLLHUP?A hangup has occurred on the stream. This "
"event and POLLOUT are mutually exclusive; a "
"stream can never be writable if a hangup has "
"occurred. However, this event and POLLIN, "
", POLLRDBAND, or POLLPRI are not "
"mutually exclusive. This flag is only valid "
"in the revents bitmask; it is not used in "
"the events member.]"
"[+POLLNVAL?The specified fd value does not belong to an "
"open file. This flag is only valid in the "
"revents member; it is not used in the events "
"member.]"
"}"
"]"
"[+?If the value fd is less than 0, events is ignored and "
"revents is set to 0 in that entry on return from poll.]"
"[+?The results of the poll query are stored in the revents "
"member in the \bvar\b structure. POLL*-strings are set in the \brevents\b "
"variable to indicate which of the requested events are true. "
"If none are true, the \brevents\b will be an empty string when "
"the poll command returns. The event flags "
"POLLHUP, POLLERR, and POLLNVAL are always set in \brevents\b "
"if the conditions they indicate are true; this occurs even "
"though these flags were not present in events.]"
"[+?If none of the defined events have occurred on any selected "
"file descriptor, poll waits at least timeout milliseconds "
"for an event to occur on any of the selected file descriptors. "
"On a computer where millisecond timing accuracy is not "
"available, timeout is rounded up to the nearest legal value "
"available on that system. If the value timeout is 0, poll "
"returns immediately. If the value of timeout is -1, poll "
"blocks until a requested event occurs or until the call is "
"interrupted.]"
"[+?The poll function supports regular files, terminal and "
"pseudo-terminal devices, STREAMS-based files, FIFOs and "
"pipes. The behavior of poll on elements of fds that refer "
"to other types of file is unspecified.]"
"[+?The poll function supports sockets.]"
"[+?A file descriptor for a socket that is listening for connections "
"will indicate that it is ready for reading, once connections "
"are available. A file descriptor for a socket that "
"is connecting asynchronously will indicate that it is ready "
"for writing, once a connection has been established.]"
"[+?Regular files always poll TRUE for reading and writing.]"
"[e:eventarray]:[fdcount?Upon successful completion, an indexed array "
"of strings is returned which contains a list of array subscripts "
"in the poll array which received events.]"
"[t:timeout]:[seconds?Timeout in seconds. If the value timeout is 0, "
"poll returns immediately. If the value of timeout is -1, poll "
"blocks until a requested event occurs or until the call is "
"interrupted.]"
"[T:mtimeout]:[milliseconds?Timeout in milliseconds. If the value timeout is 0, "
"poll returns immediately. If the value of timeout is -1, poll "
"blocks until a requested event occurs or until the call is "
"interrupted.]"
"\n"
"\nvar\n"
"\n"
"[+EXIT STATUS?]{"
"[+0?Success.]"
"[+>0?An error occurred.]"
"}"
"[+SEE ALSO?\bopen\b(1),\btmpfile\b(1),\bdup\b(1),\bclose\b(1),\bpoll\b(2)]"
;
/*
* |mystpcpy| - like |strcpy()| but returns the end of the buffer
*
* Copy string s2 to s1. s1 must be large enough.
* return s1-1 (position of string terminator ('\0') in destnation buffer).
*/
static
{
;
return (s1-1);
}
static
{
char varnamebuff[PATH_MAX];
}
static
int poll_strtoevents(const char *str)
{
int events = 0;
return events;
}
static
void poll_eventstostr(char *s, int events)
{
*s='\0';
if (!events)
return;
/* Remove trailling '|' */
s--;
if(*s=='|')
*s='\0';
}
{
char *varname;
int n;
int fd;
int i;
char *s;
double timeout = -1.;
char *eventarrayname = NULL;
{
case 't':
case 'T':
errno = 0;
if (errno != 0)
/* -t uses seconds, -T milliseconds */
if (n == 't')
timeout *= 1000.;
break;
case 'e':
break;
case ':':
break;
case '?':
break;
}
if(argc!=1)
const char *subname;
if (!array_np)
/* Count number of array elememts. We need to do it "manually" to
* handle sparse indexed and associative arrays */
do
{
break;
numpollfd++;
#ifdef __GNUC__
/*
* Allocate stack space via |alloca()| for gcc builds since ctfconvert
* is unable to handle VLAs from gcc. We need this until CR #6379193
* is fixed.
*/
#else
/* We must allocate one more entry with VLA with zero elements do not work with all compilers */
#endif /* __GNUC__ */
i = 0;
do
{
break;
if (!np)
if (!np)
if (!s)
i++;
/* FixMe: EGAIN and EINTR may require extra handling */
if (n < 0)
if (eventarrayname)
{
if (!np)
}
i = 0;
do
{
break;
if (!np)
{
}
i++;
return(0);
}