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.TH pbs_modify_resv 3B "20 February 2018" Local "PBS Professional"
.SH NAME
pbs_modify_resv - modify a PBS reservation
.SH SYNOPSIS
#include <pbs_error.h>
.br
#include <pbs_ifl.h>
.sp
.B char *pbs_modify_resv(int server_connect, char *resv_id, struct attropl *attrib, char *extend)

.SH DESCRIPTION
Issue a batch request to modify a reservation.
.LP
A
.I "Modify Reservation"
batch request is generated and sent to the server.
The parameter
.I server_connect 
is the socket on which we connect to the server.
The parameter 
.I resv_id
is the reservation ID.
.LP
The parameter
.I attrib
is a list of attributes to be changed.
Each attribute is an 
.I attropl
structure which is defined in pbs_ifl.h as:
.sp
.Ty
.nf
    struct attrl {
        char   *name;
        char   *resource;
        char   *value;
        struct attrl *next;
        enum batch_op op;
    };
.fi
.sp
The
.I attrib
list is terminated by the first entry where
.I next
is a null pointer.
.LP
The
.I name
member points to a string which is the name of the attribute.  The
.I value
member points to a string which is the value of the attribute.
The attribute names are defined in pbs_ifl.h.
.LP
If an attribute is not named in the
.I attrib
array, the default action is taken.  It is either assigned
the default value or is not passed with the reservation.  The action
depends on the attribute.
If
.I attrib
itself is a null pointer, then the default action is taken for
each attribute.
.LP
An attribute of type ATTR_l (the letter ell) has 
a resource name indicated by
.I resource 
in the
.I attrl
structure.
All other attribute types should have a pointer to a null string for
.I resource.
.LP
The
.I op
member is forced to a value of 
.I SET
by pbs_modify_resv().
.LP
The parameter,
.I extend,
is reserved for implementation-defined extensions.
.LP
The return value is a character string which is the
.I reservation identifier
assigned to the job by the server.
The space for the 
.I reservation identifier
string is allocated by \f3pbs_modify_resv\f1()
and should be released via a call to \f3free\f1()
by the user when no longer needed.

.SH "SEE ALSO"
pbs_rsub(1B) and pbs_connect(3B)

.SH DIAGNOSTICS
When the batch request generated by pbs_modify_resv()
function has been completed successfully by a batch server, the routine will
return a pointer to a character string which is the reservation identifier of the
modified reservation.
Otherwise, a null pointer is returned and the error code is set in pbs_error.