Implementing the redirection


 
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Old 11-30-2006
Implementing the redirection

Hi all
I am facing a problem with redirection. Its somewhat related to parsing.
I am following the following steps.
1. take the command and tokenize it.
2. if redirection is there then give it to redirection unit
3. if pipe is there give it to piping unit.
4. do until the command ends


Could you please tell me are these steps right as I am a new guy. Please tell me how Shell do the parsing of a command.
I am doing in C language.
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scds_timerun(3HA)					 Sun Cluster HA and Data Services					 scds_timerun(3HA)

NAME
scds_timerun - execute a given command in a given amount of time SYNOPSIS
cc [flags...] -I /usr/cluster/include file -L /usr/cluster/lib -l dsdev #include <rgm/libdsdev.h> scha_err_t scds_timerun(scds_handle_t handle, const char *command, time_t timeout, int signal, int *cmd_exit_code DESCRIPTION
The scds_timerun() function executes a specified command using hatimerun(1M). If the command does not complete within the allotted time period,which is specified by the timeout argument, scds_timerun() sends a signal, specified by the signal argument, to kill it. The command argument does not support I/O redirection. However, you can write a script to perform redirection and then identify this script in the command argument as the command for scds_timerun() to execute. PARAMETERS
The following parameters are supported: handle The handle returned from scds_initialize(3HA) command String containing the command to run timeout Time, in seconds, allotted to run the command signal Signal to kill the command if it is still running when the timeout expires. If signal = -1, then SIGKILL is used. See signal(3HEAD). cmd_exit_code Return code from execution of the command RETURN VALUES
The scds_timerun() function returns the following: 0 The function succeeded. non-zero The function failed. ERRORS
SCHA_ERR_NOERR The command executed and cmd_exit_code contains the child program's exit status. SCHA_ERR_INTERNAL The timeout did not occur, but some other error was detected by scds_timerun() that was not an error detected by the child program. Or hatimerun(1M) caught the signal SIGTERM. SCHA_ERR_INVAL There was an invalid input argument. SCHA_ERR_TIMEOUT The timeout occurred before the command specified by the command argument finished executing. See scha_calls(3HA) for a description of other error codes. FILES
/usr/cluster/include/rgm/libdsdev.h Include file /usr/cluster/lib/libdsdev.so Library ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscdev | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
hatimerun(1M), scds_initialize(3HA), scha_calls(3HA), signal(3HEAD), attributes(5) Sun Cluster 3.2 7 Sep 2007 scds_timerun(3HA)