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Full Discussion: fork: Resource temporarily unavailable - What can I check ?
Operating Systems Solaris fork: Resource temporarily unavailable - What can I check ? Post 302113986 by Perderabo on Wednesday 11th of April 2007 10:41:06 PM
Old 04-11-2007
Quote:
Originally Posted by porter
If you can't fork you can't run a command in a shell to see why it can't fork, as it needs to fork to create the process to run the command in.
First, reborg suggested arranging for a command to run every five minutes which might show /tmp filling prior to being totally filled. And it is possible for a large process to be unable to fork while smaller processes have no problem. This is actually quite common. Finally, it is not exactly true that a shell must fork to run a command. A shell is programming language with lots of built in commands. Can't launch ls?
$ myls() { while [ $# -ne 0 ] ; do echo "$1" ; shift ; done ; }
$ myls /etc/s*
/etc/services
/etc/shells
/etc/syslog.conf
$
Can't launch cat?
$ mycat() { while IFS="" read l ; do echo "$l" ; done < $1 ; }
$ mycat /etc/shells
#
# This is a list of valid login shells (single rooted).
# Ftpd must see one of these shells as a user's login shell to connect.
#
/bin/sh
/bin/ksh
/bin/csh
/bin/tcsh
/usr/local/bin/bash
$
None of that needed a single fork provided I use ksh. I can conjure up limited versions of quite a few commands this way. And if I am desperate to diagnose a stalled OS before I cycle power, I have a final trick...I can run a single command by using exec...
exec df -k
A box that cannot fork can often exec.
 

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LEARN ABOUT SUNOS

endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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